diff --git a/libs/ardour/ardour/audiosource.h b/libs/ardour/ardour/audiosource.h
index a92b00fc47..bf6472a81e 100644
--- a/libs/ardour/ardour/audiosource.h
+++ b/libs/ardour/ardour/audiosource.h
@@ -30,7 +30,6 @@
 
 #include <glibmm/threads.h>
 #include <boost/function.hpp>
-#include <boost/scoped_array.hpp>
 
 #include "ardour/source.h"
 #include "ardour/ardour.h"
@@ -156,7 +155,7 @@ class LIBARDOUR_API AudioSource : virtual public Source, public ARDOUR::AudioRea
 	mutable double _last_scale;
 	mutable off_t _last_map_off;
 	mutable size_t  _last_raw_map_length;
-	mutable boost::scoped_array<PeakData> peak_cache;
+	mutable std::unique_ptr<PeakData[]> peak_cache;
 };
 
 }
diff --git a/libs/ardour/ardour/export_channel.h b/libs/ardour/ardour/export_channel.h
index e7188e72c8..6867c480ab 100644
--- a/libs/ardour/ardour/export_channel.h
+++ b/libs/ardour/ardour/export_channel.h
@@ -26,8 +26,6 @@
 #include <memory>
 #include <set>
 
-#include <boost/scoped_array.hpp>
-
 #include "pbd/ringbuffer.h"
 #include "pbd/signals.h"
 
@@ -103,7 +101,7 @@ public:
 private:
 	PortSet                                             ports;
 	samplecnt_t                                         _buffer_size;
-	boost::scoped_array<Sample>                         _buffer;
+	std::unique_ptr<Sample[]>                           _buffer;
 	mutable AudioBuffer                                 _buf;
 	std::list<std::shared_ptr<PBD::RingBuffer<Sample>>> _delaylines;
 };
@@ -182,8 +180,8 @@ private:
 	samplepos_t region_start;
 	samplepos_t position;
 
-	boost::scoped_array<Sample> mixdown_buffer;
-	boost::scoped_array<Sample> gain_buffer;
+	std::unique_ptr<Sample[]> mixdown_buffer;
+	std::unique_ptr<Sample[]> gain_buffer;
 
 	PBD::ScopedConnection export_connection;
 };
diff --git a/libs/ardour/audio_playlist_source.cc b/libs/ardour/audio_playlist_source.cc
index e832dd2db3..caf97f6d32 100644
--- a/libs/ardour/audio_playlist_source.cc
+++ b/libs/ardour/audio_playlist_source.cc
@@ -138,8 +138,8 @@ AudioPlaylistSource::read_unlocked (Sample* dst, samplepos_t start, samplecnt_t
 		to_zero = 0;
 	}
 
-	boost::scoped_array<float> sbuf(new float[to_read]);
-	boost::scoped_array<gain_t> gbuf(new gain_t[to_read]);
+	std::unique_ptr<float[]> sbuf(new float[to_read]);
+	std::unique_ptr<gain_t[]> gbuf(new gain_t[to_read]);
 
 	std::dynamic_pointer_cast<AudioPlaylist>(_playlist)->read (dst, sbuf.get(), gbuf.get(), timepos_t (start)+_playlist_offset, timecnt_t (to_read), _playlist_channel);
 
diff --git a/libs/ardour/audio_track.cc b/libs/ardour/audio_track.cc
index 6fb2036522..baa1b9ccb3 100644
--- a/libs/ardour/audio_track.cc
+++ b/libs/ardour/audio_track.cc
@@ -23,8 +23,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <boost/scoped_array.hpp>
-
 #include "pbd/enumwriter.h"
 #include "pbd/error.h"
 
@@ -209,8 +207,8 @@ AudioTrack::export_stuff (BufferSet& buffers, samplepos_t start, samplecnt_t nfr
                           std::shared_ptr<Processor> endpoint, bool include_endpoint, bool for_export, bool for_freeze,
                           MidiNoteTracker& /* ignored, this is audio */)
 {
-	boost::scoped_array<gain_t> gain_buffer (new gain_t[nframes]);
-	boost::scoped_array<Sample> mix_buffer (new Sample[nframes]);
+	std::unique_ptr<gain_t[]> gain_buffer (new gain_t[nframes]);
+	std::unique_ptr<Sample[]> mix_buffer (new Sample[nframes]);
 
 	Glib::Threads::RWLock::ReaderLock rlock (_processor_lock);
 
diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc
index 4a7e74432e..bbbad9a443 100644
--- a/libs/ardour/audioregion.cc
+++ b/libs/ardour/audioregion.cc
@@ -29,8 +29,6 @@
 #include <memory>
 #include <set>
 
-#include <boost/scoped_array.hpp>
-
 #include <glibmm/fileutils.h>
 #include <glibmm/threads.h>
 
@@ -731,8 +729,8 @@ AudioRegion::read_at (Sample*     buf,
 		_cache_tail  = 0;
 	}
 
-	boost::scoped_array<gain_t> gain_array;
-	boost::scoped_array<Sample> mixdown_array;
+	std::unique_ptr<gain_t[]> gain_array;
+	std::unique_ptr<Sample[]> mixdown_array;
 
 	bool nofx = false; // apply region fades at the end
 
@@ -2258,9 +2256,9 @@ AudioRegion::get_transients (AnalysisFeatureList& results)
 AudioIntervalResult
 AudioRegion::find_silence (Sample threshold, samplecnt_t min_length, samplecnt_t fade_length, InterThreadInfo& itt) const
 {
-	samplecnt_t const block_size = 64 * 1024;
-	boost::scoped_array<Sample> loudest (new Sample[block_size]);
-	boost::scoped_array<Sample> buf (new Sample[block_size]);
+	constexpr samplecnt_t block_size = 64 * 1024;
+	std::unique_ptr<Sample[]> loudest (new Sample[block_size]);
+	std::unique_ptr<Sample[]> buf (new Sample[block_size]);
 
 	assert (fade_length >= 0);
 	assert (min_length > 0);
diff --git a/libs/ardour/audiosource.cc b/libs/ardour/audiosource.cc
index e65b2eecac..8441a9385a 100644
--- a/libs/ardour/audiosource.cc
+++ b/libs/ardour/audiosource.cc
@@ -359,7 +359,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 		samplecnt_t peak = 0;
 
 #if 1 // direct read
-		boost::scoped_array<Sample> buf(new Sample[scm]);
+		std::unique_ptr<Sample[]> buf(new Sample[scm]);
 		while (peak < npeaks && cnt > 0) {
 			samplecnt_t samples_read = read_unlocked (buf.get(), start, scm);
 			if (samples_read == 0) {
@@ -478,7 +478,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 		   both max and min peak values.
 		*/
 
-		boost::scoped_array<Sample> raw_staging(new Sample[cnt]);
+		std::unique_ptr<Sample[]> raw_staging(new Sample[cnt]);
 
 		if (read_unlocked (raw_staging.get(), start, cnt) != cnt) {
 			error << _("cannot read sample data for unscaled peak computation") << endmsg;
@@ -606,7 +606,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 			samplecnt_t start_offset = next_visual_peak_sample - start;
 
 			peak_cache.reset (new PeakData[npeaks]);
-			boost::scoped_array<PeakData> staging (new PeakData[chunksize]);
+			std::unique_ptr<PeakData[]> staging (new PeakData[chunksize]);
 
 			char* addr;
 #ifdef PLATFORM_WINDOWS
@@ -669,7 +669,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 
 			/* add data between start and sample corresponding to map_off */
 			if (start_offset > 0) {
-				boost::scoped_array<Sample> buf(new Sample[start_offset]);
+				std::unique_ptr<Sample[]> buf (new Sample[start_offset]);
 				samplecnt_t samples_read = read_unlocked (buf.get(), start, start_offset);
 				find_peaks (buf.get(), samples_read, &peak_cache[0].min, &peak_cache[0].max);
 			}
@@ -678,7 +678,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 			samplecnt_t last_sample_from_peakfile = current_stored_peak * samples_per_file_peak;
 			if (last_sample_from_peakfile < start + cnt && nvisual_peaks > 0) {
 				samplecnt_t to_read = start + cnt - last_sample_from_peakfile;
-				boost::scoped_array<Sample> buf(new Sample[to_read]);
+				std::unique_ptr<Sample[]> buf (new Sample[to_read]);
 				samplecnt_t samples_read = read_unlocked (buf.get(), last_sample_from_peakfile, to_read);
 				find_peaks (buf.get(), samples_read, &peak_cache[nvisual_peaks - 1].min, &peak_cache[nvisual_peaks - 1].max);
 			}
@@ -715,7 +715,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 		samplecnt_t i = 0;
 		samplecnt_t nvisual_peaks = 0;
 		samplecnt_t chunksize = (samplecnt_t) min (cnt, (samplecnt_t) 4096);
-		boost::scoped_array<Sample> raw_staging(new Sample[chunksize]);
+		std::unique_ptr<Sample[]> raw_staging(new Sample[chunksize]);
 
 		double pixel_pos         = start / samples_per_visual_peak;
 		double next_pixel_pos    = 1.0 + floor (pixel_pos);
@@ -787,7 +787,7 @@ AudioSource::read_peaks_with_fpp (PeakData *peaks, samplecnt_t npeaks, samplepos
 int
 AudioSource::build_peaks_from_scratch ()
 {
-	const samplecnt_t bufsize = 65536; // 256kB per disk read for mono data is about ideal
+	constexpr samplecnt_t bufsize = 65536; // 256kB per disk read for mono data is about ideal
 
 	DEBUG_TRACE (DEBUG::Peaks, "Building peaks from scratch\n");
 
@@ -806,14 +806,14 @@ AudioSource::build_peaks_from_scratch ()
 		samplecnt_t cnt = _length.samples();
 
 		_peaks_built = false;
-		boost::scoped_array<Sample> buf(new Sample[bufsize]);
+		std::array<Sample, bufsize> buf;
 
 		while (cnt) {
 
 			samplecnt_t samples_to_read = min (bufsize, cnt);
 			samplecnt_t samples_read;
 
-			if ((samples_read = read_unlocked (buf.get(), current_sample, samples_to_read)) != samples_to_read) {
+			if ((samples_read = read_unlocked (buf.data(), current_sample, samples_to_read)) != samples_to_read) {
 				error << string_compose(_("%1: could not write read raw data for peak computation (%2)"), _name, strerror (errno)) << endmsg;
 				done_with_peakfile_writes (false);
 				goto out;
@@ -828,7 +828,7 @@ AudioSource::build_peaks_from_scratch ()
 				goto out;
 			}
 
-			if (compute_and_write_peaks (buf.get(), current_sample, samples_read, true, false, _FPP)) {
+			if (compute_and_write_peaks (buf.data(), current_sample, samples_read, true, false, _FPP)) {
 				break;
 			}
 
@@ -934,7 +934,6 @@ AudioSource::compute_and_write_peaks (Sample const * buf, samplecnt_t first_samp
 	samplecnt_t samples_done;
 	const size_t blocksize = (128 * 1024);
 	off_t first_peak_byte;
-	boost::scoped_array<Sample> buf2;
 
 	if (-1 == _peakfile_fd) {
 		if (prepare_for_peakfile_writes ()) {
@@ -994,7 +993,7 @@ AudioSource::compute_and_write_peaks (Sample const * buf, samplecnt_t first_samp
 		/* make a new contiguous buffer containing leftovers and the new stuff */
 
 		to_do = cnt + peak_leftover_cnt;
-		buf2.reset(new Sample[to_do]);
+		std::unique_ptr<Sample[]> buf2(new Sample[to_do]);
 
 		/* the remnants */
 		memcpy (buf2.get(), peak_leftovers, peak_leftover_cnt * sizeof (Sample));
@@ -1018,7 +1017,7 @@ AudioSource::compute_and_write_peaks (Sample const * buf, samplecnt_t first_samp
 		to_do = cnt;
 	}
 
-	boost::scoped_array<PeakData> peakbuf(new PeakData[(to_do/fpp)+1]);
+	std::unique_ptr<PeakData[]> peakbuf(new PeakData[(to_do/fpp)+1]);
 	peaks_computed = 0;
 	current_sample = first_sample;
 	samples_done = 0;
diff --git a/libs/ardour/disk_reader.cc b/libs/ardour/disk_reader.cc
index f04ee305f5..f5c525fad2 100644
--- a/libs/ardour/disk_reader.cc
+++ b/libs/ardour/disk_reader.cc
@@ -17,8 +17,6 @@
  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  */
 
-#include <boost/smart_ptr/scoped_array.hpp>
-
 #include "pbd/enumwriter.h"
 #include "pbd/memento_command.h"
 #include "pbd/playback_buffer.h"
@@ -723,9 +721,9 @@ DiskReader::overwrite_existing_audio ()
 		chunk2_cnt = to_overwrite - chunk1_cnt;
 	}
 
-	boost::scoped_array<Sample> sum_buffer (new Sample[to_overwrite]);
-	boost::scoped_array<Sample> mixdown_buffer (new Sample[to_overwrite]);
-	boost::scoped_array<float>  gain_buffer (new float[to_overwrite]);
+	std::unique_ptr<Sample[]> sum_buffer (new Sample[to_overwrite]);
+	std::unique_ptr<Sample[]> mixdown_buffer (new Sample[to_overwrite]);
+	std::unique_ptr<float[]>  gain_buffer (new float[to_overwrite]);
 	uint32_t                    n   = 0;
 	bool                        ret = true;
 	samplepos_t                 start = overwrite_sample;
@@ -1136,11 +1134,14 @@ DiskReader::do_refill_with_alloc (bool partial_fill, bool reversed)
 	 * samples would be 1M samples. But we might use 16 or 14 bit samples,
 	 * in which case 4MB is more samples than that. Therefore size this for
 	 * the smallest sample value .. 4MB = 2M samples (16 bit).
+	 *
+	 * Note, we cannot use std::array<> here since stack-size is limited.
 	 */
 
-	boost::scoped_array<Sample> sum_buf (new Sample[2 * 1048576]);
-	boost::scoped_array<Sample> mix_buf (new Sample[2 * 1048576]);
-	boost::scoped_array<float>  gain_buf (new float[2 * 1048576]);
+	constexpr size_t chunksize = 2 * 1048576;
+	std::unique_ptr<Sample[]> sum_buf (new Sample[chunksize]);
+	std::unique_ptr<Sample[]> mix_buf (new Sample[chunksize]);
+	std::unique_ptr<float[]>  gain_buf (new float[chunksize]);
 
 	return refill_audio (sum_buf.get (), mix_buf.get (), gain_buf.get (), (partial_fill ? _chunk_samples : 0), reversed);
 }
@@ -1993,8 +1994,8 @@ DiskReader::setup_preloop_buffer ()
 	}
 
 	Location*                   loc = _loop_location;
-	boost::scoped_array<Sample> mix_buf (new Sample[loop_fade_length]);
-	boost::scoped_array<Sample> gain_buf (new Sample[loop_fade_length]);
+	std::unique_ptr<Sample[]> mix_buf (new Sample[loop_fade_length]);
+	std::unique_ptr<Sample[]> gain_buf (new Sample[loop_fade_length]);
 	const timepos_t             read_start = timepos_t (loc->start_sample () - loop_declick_out.fade_length);
 	const timecnt_t             read_cnt   = timecnt_t (loop_declick_out.fade_length);
 
diff --git a/libs/ardour/import.cc b/libs/ardour/import.cc
index 640aa7ee64..59708955bb 100644
--- a/libs/ardour/import.cc
+++ b/libs/ardour/import.cc
@@ -40,7 +40,6 @@
 #include "pbd/gstdio_compat.h"
 #include <glibmm.h>
 
-#include <boost/scoped_array.hpp>
 #include <boost/scoped_ptr.hpp>
 #include <boost/shared_array.hpp>
 
@@ -267,7 +266,7 @@ write_audio_data_to_new_files (ImportableSource* source, ImportStatus& status,
 		return;
 	}
 
-	boost::scoped_array<float> data(new float[nframes * channels]);
+	std::unique_ptr<float[]> data(new float[nframes * channels]);
 	vector<boost::shared_array<Sample> > channel_data;
 
 	for (uint32_t n = 0; n < channels; ++n) {
diff --git a/libs/backends/portaudio/winmmemidi_input_device.h b/libs/backends/portaudio/winmmemidi_input_device.h
index 9dd67cf336..7fd830f7fa 100644
--- a/libs/backends/portaudio/winmmemidi_input_device.h
+++ b/libs/backends/portaudio/winmmemidi_input_device.h
@@ -27,7 +27,6 @@
 
 #include <string>
 
-#include <boost/scoped_array.hpp>
 #include <boost/scoped_ptr.hpp>
 
 #include <pbd/ringbuffer.h>
@@ -97,7 +96,7 @@ private: // data
 
 	// can't use unique_ptr yet
 	boost::scoped_ptr<PBD::RingBuffer<uint8_t> > m_midi_buffer;
-	boost::scoped_array<uint8_t> m_sysex_buffer;
+	std::unique_ptr<uint8_t[]> m_sysex_buffer;
 };
 
 }
diff --git a/libs/waveview/wave_view.cc b/libs/waveview/wave_view.cc
index bc97d922c5..b3414ef4e4 100644
--- a/libs/waveview/wave_view.cc
+++ b/libs/waveview/wave_view.cc
@@ -20,8 +20,6 @@
 
 #include <cmath>
 
-#include <boost/scoped_array.hpp>
-
 #include <cairomm/cairomm.h>
 
 #include <glibmm/threads.h>
@@ -475,7 +473,7 @@ WaveView::draw_image (Cairo::RefPtr<Cairo::ImageSurface>& image, PeakData* peaks
 	clip_context->set_antialias (Cairo::ANTIALIAS_NONE);
 	zero_context->set_antialias (Cairo::ANTIALIAS_NONE);
 
-	boost::scoped_array<LineTips> tips (new LineTips[n_peaks]);
+	std::unique_ptr<LineTips[]> tips (new LineTips[n_peaks]);
 
 	/* Clip level nominally set to -0.9dBFS to account for inter-sample
 	   interpolation possibly clipping (value may be too low).
@@ -898,7 +896,7 @@ WaveView::process_draw_request (std::shared_ptr<WaveViewDrawRequest> req)
 
 	assert (n_peaks > 0 && n_peaks < 32767);
 
-	boost::scoped_array<ARDOUR::PeakData> peaks (new PeakData[n_peaks]);
+	std::unique_ptr<ARDOUR::PeakData[]> peaks (new PeakData[n_peaks]);
 
 	/* Note that Region::read_peaks() takes a start position based on an
 	   offset into the Region's **SOURCE**, rather than an offset into