diff --git a/audacity.dox.in b/audacity.dox.in
index aa7fe512212453b493d22c777cde36231d4e5c15..17a8935640a2b5085d5cf7acc1a1b5e12264cd0b 100644
--- a/audacity.dox.in
+++ b/audacity.dox.in
@@ -2071,7 +2071,6 @@ PREDEFINED = AUDACITY_DLL_API \
USE_AUDIO_UNITS \
USE_MIDI=1 \
USE_LIBVORBIS=1 \
- USE_LIBMAD=1 \
USE_LIBFLAC=1 \
USE_SBSMS=1 \
USE_GSTREAMER \
diff --git a/help/audacity.1 b/help/audacity.1
index 5ef26888670e3059c64849600b549d36cd5b6565..05daa7cbc4ac386d7ee9f628ebf3c0bedba4549e 100644
--- a/help/audacity.1
+++ b/help/audacity.1
@@ -33,7 +33,6 @@ Audacity currently uses
.B libsndfile
to open many uncompressed audio formats such as WAV,
AIFF, and AU, and it can also be linked to
-.B libmad,
.B libvorbis,
and
.B libflac,
diff --git a/lib-src/audacity-patches.txt b/lib-src/audacity-patches.txt
index 416312b1bdbf944559a6a6ff41faba94c98ca465..085f4f40f10dc100e5c78bec82d93b16404f91f7 100644
--- a/lib-src/audacity-patches.txt
+++ b/lib-src/audacity-patches.txt
@@ -24,28 +24,6 @@ Patches: mac-asm-fixes.patch. Fixes build on OS X Intel 10.4 by creating and
gcc (4.0)...not need after we upgrade past Xcode 3.2.6.
Upstream version: 1.3.1
-libid3tag
----------
-MP3 tag manipulation library. Comes with libmad (below)
-arguments ([-Wall foreign]) added to AM_INIT_AUTOMAKE to avoid autoreconf
-failures
-arguments (--no-verify) removed from ltconfig execution to prevent configure
-failures
-Patches: libid3tag-srcdir.patch Adds srcdir handling
-
-libmad
-------
-http://www.underbit.com/products/mad/
-MP3 decoding library
-Version in Audacity SVN: 0.15.1 (beta)
-Patches: libmad-mp2-out-of-spec.patch: Import some forms of MP2 file that are
-theoretically out of spec but in practise work fine (msmeyer)
-osx-universal-build.patch: Makes build work on OS X for universal binary by
-using compiler-defined symbols for targets as well as hosts.
-autotools.patch: Update to autotools to work with recent auto{conf,
-make}
-Upstream version: 0.15.1 (beta)
-
libnyquist
----------
Digital Audio scripting language, with our own library interface added to it
diff --git a/linux/packages/arch/PKGBUILD b/linux/packages/arch/PKGBUILD
index 0112b911b153c8a1919ef6ab9e862f3cc8b0a9e2..6918491cc7e392ba3907950250c20b3b05fdb47d 100644
--- a/linux/packages/arch/PKGBUILD
+++ b/linux/packages/arch/PKGBUILD
@@ -18,7 +18,6 @@ depends=(zlib
flac
lame
twolame
- libmad
libsndfile
jack
lilv
diff --git a/linux/packages/arch/dependencies.sh b/linux/packages/arch/dependencies.sh
index 3c8b25e03b61fe74d4f4313dd768bd6ab92f86cf..ac296eeecb5bf992811554a20bd48814b108563e 100755
--- a/linux/packages/arch/dependencies.sh
+++ b/linux/packages/arch/dependencies.sh
@@ -18,7 +18,6 @@ deps=(
flac
lame
twolame
- libmad
libsndfile
jack
lilv
diff --git a/linux/packages/fedora34/audacity.spec b/linux/packages/fedora34/audacity.spec
index 71678e0de33246caf429cd29de5a2266e9d53144..deffb976b5b4220188d4129ce328b7029bc935e9 100644
--- a/linux/packages/fedora34/audacity.spec
+++ b/linux/packages/fedora34/audacity.spec
@@ -32,7 +32,6 @@ BuildRequires: jack-audio-connection-kit-devel
BuildRequires: ladspa-devel
BuildRequires: lame-devel
BuildRequires: libid3tag-devel
-BuildRequires: libmad-devel
BuildRequires: taglib-devel
BuildRequires: twolame-devel
BuildRequires: libogg-devel
diff --git a/linux/packages/fedora34/dependencies.sh b/linux/packages/fedora34/dependencies.sh
index b25de51c2b9a88d265655c66865b7355dc15c891..64cc26426df1ab7a1956370cff6806cdcc049aeb 100755
--- a/linux/packages/fedora34/dependencies.sh
+++ b/linux/packages/fedora34/dependencies.sh
@@ -22,7 +22,6 @@ deps=(
ladspa-devel
lame-devel
libid3tag-devel
- libmad-devel
taglib-devel
twolame-devel
libogg-devel
diff --git a/linux/packages/ubuntu-20.04/debian/control b/linux/packages/ubuntu-20.04/debian/control
index 96f764ce24353dacb01f863d024fdce1c7388822..5c47b526434a977a2dcd797a22fb706800695a36 100644
--- a/linux/packages/ubuntu-20.04/debian/control
+++ b/linux/packages/ubuntu-20.04/debian/control
@@ -23,7 +23,6 @@ Build-Depends: cmake,
libavformat-dev,
libavutil-dev,
libid3tag0-dev,
- libmad0-dev,
libvamp-hostsdk3v5,
libogg-dev,
libvorbis-dev,
diff --git a/linux/packages/ubuntu-20.04/dependencies.sh b/linux/packages/ubuntu-20.04/dependencies.sh
index b8c4d011ff82bd5e4fa3aaa44c4fb547755d37bb..09cb2a6eb39577aef08dfd49fca4e31ad12734a0 100755
--- a/linux/packages/ubuntu-20.04/dependencies.sh
+++ b/linux/packages/ubuntu-20.04/dependencies.sh
@@ -36,7 +36,6 @@ deps=(
libavformat-dev
libavutil-dev
libid3tag0-dev
- libmad0-dev
libvamp-hostsdk3v5
libogg-dev
libvorbis-dev
diff --git a/linux/required_libraries.md b/linux/required_libraries.md
index 8de6e7718260a080bbfa6d40a399e83399aeb063..6e9a89a921b2fe63afe0fe06447993152f4f591d 100644
--- a/linux/required_libraries.md
+++ b/linux/required_libraries.md
@@ -10,7 +10,6 @@
| libcurl | >= 7.68.0 | libcurl-dev |
| ffmpeg | >= 4.2.4 | libavcodec-dev libavformat-dev libavutil-dev |
| libid3tag | >= 0.15.1b | libid3tag0-dev |
-| libmad | >= 0.15.1b | libmad0-dev |
| vamp-host-sdk | >= 2.9.0 | N/A |
| libogg | >= 1.3.4 | libogg-dev |
| libvorbis | >= 1.3.6 | libvorbis-dev |
diff --git a/linux/ubuntu-focal/dependencies.sh b/linux/ubuntu-focal/dependencies.sh
index 23b3cd74730fc20f342a311f10464df8dbeb60e3..ac40ad32bd4829f1957278e672096b53c48b96ea 100644
--- a/linux/ubuntu-focal/dependencies.sh
+++ b/linux/ubuntu-focal/dependencies.sh
@@ -30,7 +30,6 @@ apt_packages_full_deps=(
libavformat-dev
libavutil-dev
libid3tag0-dev
- libmad0-dev
libvamp-hostsdk3v5
libogg-dev
libvorbis-dev
diff --git a/linux/ubuntu-focal/entrypoint.sh b/linux/ubuntu-focal/entrypoint.sh
index ee818961af333ba60164a0f9d35a69f8f334c7e0..c74af6b09796f117d97255143bfc10ded087b70c 100644
--- a/linux/ubuntu-focal/entrypoint.sh
+++ b/linux/ubuntu-focal/entrypoint.sh
@@ -25,7 +25,6 @@ cmake_options=(
-Daudacity_use_sqlite=local # We prefer using the latest version of SQLite
-Daudacity_use_ffmpeg=loaded
-Daudacity_use_id3tag=system # This library has bugs, that are fixed in *local* version
- -Daudacity_use_mad=system # This library has bugs, that are fixed in *local* version
-Daudacity_use_nyquist=local # This library is not available
-Daudacity_use_vamp=local # The dev package for this library is not available
-Daudacity_use_ogg=system
diff --git a/src/AboutDialog.cpp b/src/AboutDialog.cpp
index 3961b4c4b50c9f50197d8f24ca40ffaefdc64816..83ef2611f0d8fce5a393fc840d62e46eeb8e535c 100644
--- a/src/AboutDialog.cpp
+++ b/src/AboutDialog.cpp
@@ -241,7 +241,6 @@ void AboutDialog::CreateCreditsList()
AddCredit(wxT("[[https://libexpat.github.io/|expat]]"), roleLibrary);
AddCredit(wxT("[[https://xiph.org/flac/|FLAC]]"), roleLibrary);
AddCredit(wxT("[[http://lame.sourceforge.net/|LAME]]"), roleLibrary);
- AddCredit(wxT("[[https://www.underbit.com/products/mad/|libmad]]"), roleLibrary);
AddCredit(wxT("[[http://www.mega-nerd.com/libsndfile/|libsndfile]]"), roleLibrary);
AddCredit(wxT("[[https://sourceforge.net/p/soxr/wiki/Home/|libsoxr]]"), roleLibrary);
AddCredit(