diff --git a/pkgs/servers/invidious/default.nix b/pkgs/servers/invidious/default.nix
new file mode 100644
index 000000000000..183770a94f41
--- /dev/null
+++ b/pkgs/servers/invidious/default.nix
@@ -0,0 +1,99 @@
+{ lib, crystal, fetchFromGitHub, librsvg, pkg-config, libxml2, openssl, sqlite, lsquic, nixosTests }:
+let
+  # When updating, always update the following:
+  #  * the git revision
+  #  * the version attribute
+  #  * the source hash (sha256)
+  # If the shards.lock file changed, also the following:
+  #  * shards.nix (by running `crystal2nix` in invidious’ source tree)
+  #  * If the lsquic.cr dependency changed: lsquic in lsquic.nix (version, sha256)
+  #  * If the lsquic version changed: boringssl' in lsquic.nix (version, sha256)
+  rev = "21b96a31599e890fe063e3e24cf5f3a995779a69";
+in
+crystal.buildCrystalPackage rec {
+  pname = "invidious";
+  version = "unstable-2021-10-15";
+
+  src = fetchFromGitHub {
+    owner = "iv-org";
+    repo = pname;
+    inherit rev;
+    sha256 = "sha256-Rp3YqjHbP6szohlaEpgopFNdLK31yrcHtyKCeVz76CA=";
+  };
+
+  postPatch =
+    let
+      # Replacing by the value (templates) of the variables ensures that building
+      # fails if upstream changes the way the metadata is formatted.
+      branchTemplate = ''{{ "#{`git branch | sed -n '/* /s///p'`.strip}" }}'';
+      commitTemplate = ''{{ "#{`git rev-list HEAD --max-count=1 --abbrev-commit`.strip}" }}'';
+      versionTemplate = ''{{ "#{`git log -1 --format=%ci | awk '{print $1}' | sed s/-/./g`.strip}" }}'';
+      # This always uses the latest commit which invalidates the cache even if
+      # the assets were not changed
+      assetCommitTemplate = ''{{ "#{`git rev-list HEAD --max-count=1 --abbrev-commit -- assets`.strip}" }}'';
+    in
+    ''
+      # Use the version metadata from the derivation instead of using git at
+      # build-time
+      substituteInPlace src/invidious.cr \
+          --replace ${lib.escapeShellArg branchTemplate} '"master"' \
+          --replace ${lib.escapeShellArg commitTemplate} '"${lib.substring 0 7 rev}"' \
+          --replace ${lib.escapeShellArg versionTemplate} '"${lib.replaceChars ["-"] ["."] (lib.substring 9 10 version)}"' \
+          --replace ${lib.escapeShellArg assetCommitTemplate} '"${lib.substring 0 7 rev}"'
+
+      # Patch the assets and locales paths to be absolute
+      substituteInPlace src/invidious.cr \
+          --replace 'public_folder "assets"' 'public_folder "${placeholder "out"}/share/invidious/assets"'
+      substituteInPlace src/invidious/helpers/i18n.cr \
+          --replace 'File.read("locales/' 'File.read("${placeholder "out"}/share/invidious/locales/'
+
+      # Reference sql initialisation/migration scripts by absolute path
+      substituteInPlace src/invidious/helpers/helpers.cr \
+            --replace 'config/sql' '${placeholder "out"}/share/invidious/config/sql'
+
+      substituteInPlace src/invidious/users.cr \
+          --replace 'Process.run(%(rsvg-convert' 'Process.run(%(${lib.getBin librsvg}/bin/rsvg-convert'
+    '';
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ libxml2 openssl sqlite ];
+
+  format = "crystal";
+  shardsFile = ./shards.nix;
+  crystalBinaries.invidious.src = "src/invidious.cr";
+
+  postConfigure = ''
+    # lib includes nix store paths which can’t be patched, so the links have to
+    # be dereferenced first.
+    cp -rL lib lib2
+    rm -r lib
+    mv lib2 lib
+    chmod +w -R lib
+    cp ${lsquic}/lib/liblsquic.a lib/lsquic/src/lsquic/ext
+  '';
+
+  postInstall = ''
+    mkdir -p $out/share/invidious/config
+
+    # Copy static parts
+    cp -r assets locales $out/share/invidious
+    cp -r config/sql $out/share/invidious/config
+  '';
+
+  # Invidious tries to open config/config.yml and connect to the database, even
+  # when running --help. This specifies a minimal configuration in an
+  # environment variable. Even though the database is bogus, --help still
+  # works.
+  installCheckPhase = ''
+    INVIDIOUS_CONFIG="database_url: sqlite3:///dev/null" $out/bin/invidious --help
+  '';
+
+  passthru.tests = { inherit (nixosTests) invidious; };
+
+  meta = with lib; {
+    description = "An open source alternative front-end to YouTube";
+    homepage = "https://invidious.io/";
+    license = licenses.agpl3;
+    maintainers = with maintainers; [ infinisil sbruder ];
+  };
+}
diff --git a/pkgs/servers/invidious/lsquic.nix b/pkgs/servers/invidious/lsquic.nix
new file mode 100644
index 000000000000..35b93e4249f2
--- /dev/null
+++ b/pkgs/servers/invidious/lsquic.nix
@@ -0,0 +1,58 @@
+{ lib, boringssl, stdenv, fetchgit, fetchFromGitHub, cmake, zlib, perl, libevent }:
+let
+  # lsquic requires a specific boringssl version (noted in its README)
+  boringssl' = boringssl.overrideAttrs (old: rec {
+    version = "251b5169fd44345f455438312ec4e18ae07fd58c";
+    src = fetchgit {
+      url = "https://boringssl.googlesource.com/boringssl";
+      rev = version;
+      sha256 = "sha256-EU6T9yQCdOLx98Io8o01rEsgxDFF/Xoy42LgPopD2/A=";
+    };
+  });
+in
+stdenv.mkDerivation rec {
+  pname = "lsquic";
+  version = "2.18.1";
+
+  src = fetchFromGitHub {
+    owner = "litespeedtech";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-hG8cUvhbCNeMOsKkaJlgGpzUrIx47E/WhmPIdI5F3qM=";
+    fetchSubmodules = true;
+  };
+
+  nativeBuildInputs = [ cmake perl ];
+  buildInputs = [ boringssl' libevent zlib ];
+
+  cmakeFlags = [
+    "-DBORINGSSL_DIR=${boringssl'}"
+    "-DBORINGSSL_LIB_crypto=${boringssl'}/lib/libcrypto.a"
+    "-DBORINGSSL_LIB_ssl=${boringssl'}/lib/libssl.a"
+    "-DZLIB_LIB=${zlib}/lib/libz.so"
+  ];
+
+  # adapted from lsquic.cr’s Dockerfile
+  # (https://github.com/iv-org/lsquic.cr/blob/master/docker/Dockerfile)
+  installPhase = ''
+    runHook preInstall
+
+    mkdir combinedlib
+    cd combinedlib
+    ar -x ${boringssl'}/lib/libssl.a
+    ar -x ${boringssl'}/lib/libcrypto.a
+    ar -x ../src/liblsquic/liblsquic.a
+    ar rc liblsquic.a *.o
+    ranlib liblsquic.a
+    install -D liblsquic.a $out/lib/liblsquic.a
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "A library for QUIC and HTTP/3 (version for Invidious)";
+    homepage = "https://github.com/litespeedtech/lsquic";
+    maintainers = with maintainers; [ infinisil sbruder ];
+    license = with licenses; [ openssl isc mit bsd3 ]; # statically links against boringssl, so has to include its licenses
+  };
+}
diff --git a/pkgs/servers/invidious/shards.nix b/pkgs/servers/invidious/shards.nix
new file mode 100644
index 000000000000..778b34496a62
--- /dev/null
+++ b/pkgs/servers/invidious/shards.nix
@@ -0,0 +1,68 @@
+{
+  athena-negotiation = {
+    owner = "athena-framework";
+    repo = "negotiation";
+    rev = "v0.1.1";
+    sha256 = "1vkk59lqrxb0l8kyzs114i3c18zb2bdiah2xhazkk8q7x6fz4yzk";
+  };
+  backtracer = {
+    owner = "sija";
+    repo = "backtracer.cr";
+    rev = "v1.2.1";
+    sha256 = "02r1l7rn2wsljkx495s5s7j04zgn73m2kx0hkzs7620camvlwbqq";
+  };
+  db = {
+    owner = "crystal-lang";
+    repo = "crystal-db";
+    rev = "v0.10.1";
+    sha256 = "03c5h14z6h2mxnx949lihnyqjd19hcj38iasdwq9fp95h8cld376";
+  };
+  exception_page = {
+    owner = "crystal-loot";
+    repo = "exception_page";
+    rev = "v0.2.0";
+    sha256 = "0nlgnh5iykbr1v2132342k2mz6s2laws6nkgqsqlwhhcr4gb4jcx";
+  };
+  kemal = {
+    owner = "kemalcr";
+    repo = "kemal";
+    rev = "v1.1.0";
+    sha256 = "07vlvddy4mba9li2bvskzqzywwq55cyvlgkz13q6dsl4zfgc96ca";
+  };
+  kilt = {
+    owner = "jeromegn";
+    repo = "kilt";
+    rev = "v0.6.1";
+    sha256 = "0dpc15y9m8c5l9zdfif6jlf7zmkrlm9w4m2igi5xa22fdjwamwfp";
+  };
+  lsquic = {
+    owner = "iv-org";
+    repo = "lsquic.cr";
+    rev = "v2.18.1-2";
+    sha256 = "0bljk0pwbjb813dfwrhgi00w2ai09k868xvak4hfzdkbmpc7id6y";
+  };
+  pg = {
+    owner = "will";
+    repo = "crystal-pg";
+    rev = "v0.24.0";
+    sha256 = "07i5bqkv5j6y6f8v5cpqdxc5wzzrvgv3ds24znv4mzv6nc84csn4";
+  };
+  protodec = {
+    owner = "iv-org";
+    repo = "protodec";
+    rev = "v0.1.4";
+    sha256 = "15azh9izxqgwpgkpicmivfdz31wkibnwy09rwhxsg0lyc4wf8xj9";
+  };
+  radix = {
+    owner = "luislavena";
+    repo = "radix";
+    rev = "v0.4.1";
+    sha256 = "1l08cydkdidq9yyil1wl240hvk41iycv04jrg6nx5mkvzw4z1bzg";
+  };
+  sqlite3 = {
+    owner = "crystal-lang";
+    repo = "crystal-sqlite3";
+    rev = "v0.18.0";
+    sha256 = "03nnvpchhq9f9ywsm3pk2rrj4a3figw7xs96zdziwgr5znkz6x93";
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index b6ef8590684f..fe53386974cb 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -6401,6 +6401,11 @@ with pkgs;
 
   intermodal = callPackage ../tools/misc/intermodal { };
 
+  invidious = callPackage ../servers/invidious {
+    # needs a specific version of lsquic
+    lsquic = callPackage ../servers/invidious/lsquic.nix { };
+  };
+
   invoice2data  = callPackage ../tools/text/invoice2data  { };
 
   inxi = callPackage ../tools/system/inxi { };