diff --git a/pkgs/by-name/po/polar-bookshelf1/package.nix b/pkgs/by-name/po/polar-bookshelf1/package.nix
deleted file mode 100644
index e67812e0de2b..000000000000
--- a/pkgs/by-name/po/polar-bookshelf1/package.nix
+++ /dev/null
@@ -1,121 +0,0 @@
-{
-  lib,
-  stdenv,
-  fetchurl,
-  alsa-lib,
-  at-spi2-atk,
-  atk,
-  autoPatchelfHook,
-  cairo,
-  cups,
-  curl,
-  dbus,
-  dpkg,
-  expat,
-  fontconfig,
-  gdk-pixbuf,
-  glib,
-  glibc,
-  gsettings-desktop-schemas,
-  gtk3,
-  libx11,
-  libxscrnsaver,
-  libxcomposite,
-  libxcursor,
-  libxdamage,
-  libxext,
-  libxfixes,
-  libxi,
-  libxrandr,
-  libxrender,
-  libxtst,
-  libnghttp2,
-  libudev0-shim,
-  libxcb,
-  makeWrapper,
-  nspr,
-  nss,
-  openssl,
-  pango,
-  wrapGAppsHook3,
-}:
-
-stdenv.mkDerivation (finalAttrs: {
-  pname = "polar-bookshelf1";
-  version = "1.100.13";
-
-  src = fetchurl {
-    url = "mirror://sourceforge/polar-bookshelf.mirror/v${finalAttrs.version}/polar-bookshelf-${finalAttrs.version}-amd64.deb";
-    hash = "sha256-TeegAq3x8LZ01KEPIlP4lTGC0a9ilnf1xX/Dqci1wEQ=";
-  };
-
-  buildInputs = [
-    alsa-lib
-    at-spi2-atk
-    atk
-    cairo
-    cups
-    dbus
-    expat
-    fontconfig
-    gdk-pixbuf
-    glib
-    gsettings-desktop-schemas
-    gtk3
-    libx11
-    libxscrnsaver
-    libxcomposite
-    libxcursor
-    libxdamage
-    libxext
-    libxfixes
-    libxi
-    libxrandr
-    libxrender
-    libxtst
-    libxcb
-    nspr
-    nss
-    pango
-  ];
-
-  nativeBuildInputs = [
-    autoPatchelfHook
-    dpkg
-    makeWrapper
-    wrapGAppsHook3
-  ];
-
-  runtimeLibs = lib.makeLibraryPath [
-    libudev0-shim
-    glibc
-    curl
-    openssl
-    libnghttp2
-  ];
-
-  installPhase = ''
-    mkdir -p $out/share/polar-bookshelf $out/bin $out/lib
-    mv opt/Polar\ Bookshelf/* $out/share/polar-bookshelf
-    mv $out/share/polar-bookshelf/*.so $out/lib
-    mv usr/share/* $out/share/
-    ln -s $out/share/polar-bookshelf/polar-bookshelf $out/bin/polar-bookshelf
-  '';
-
-  preFixup = ''
-    gappsWrapperArgs+=(--prefix LD_LIBRARY_PATH : "${finalAttrs.runtimeLibs}" )
-    # Correct desktop file `Exec`
-    substituteInPlace $out/share/applications/polar-bookshelf.desktop \
-      --replace "/opt/Polar Bookshelf/polar-bookshelf" "$out/bin/polar-bookshelf"
-  '';
-
-  meta = {
-    homepage = "https://getpolarized.io/";
-    description = "Personal knowledge repository for PDF and web content supporting incremental reading and document annotation";
-    mainProgram = "polar-bookshelf";
-    license = lib.licenses.gpl3Only;
-    maintainers = [ lib.maintainers.dansbandit ];
-    platforms = lib.platforms.linux;
-    sourceProvenance = with lib.sourceTypes; [ binaryNativeCode ];
-  };
-})
diff --git a/pkgs/top-level/aliases.nix b/pkgs/top-level/aliases.nix
index 04f6acb92b28..bdeaa6d5d848 100644
--- a/pkgs/top-level/aliases.nix
+++ b/pkgs/top-level/aliases.nix
@@ -2031,6 +2031,7 @@ mapAliases {
   podofo_0_9 = throw "'podofo_0_9' has been deprecated, it may be replaced by 'podofo0'"; # Added 2026-05-08
   podofo_0_10 = warnAlias "'podofo_0_10' has been renamed to 'podofo0'" podofo0; # Added 2026-05-08
   podofo_1_0 = throw "'podofo_1_0' has been deprecated in favour of 'podofo'"; # Added 2026-05-08
+  polar-bookshelf1 = throw "'polar-bookshelf1' has been removed as it was unmaintained upstream and vendoring an EOL version of Electron"; # Added 2026-09-01
   polar-bookshelf = throw "'polar-bookshelf' has been removed as it was unmaintained upstream and vendoring an EOL version of Electron"; # Added 2026-09-01
   polipo = throw "'polipo' has been removed as it is unmaintained upstream"; # Added 2025-05-18
   polyml56 = throw "'polyml56' has been deprecated in favor of polyml"; # Added 2026-06-01