diff --git a/Cabal/src/Distribution/Simple/Setup/Haddock.hs b/Cabal/src/Distribution/Simple/Setup/Haddock.hs
index e8d7ba54a20..aee2210d907 100644
--- a/Cabal/src/Distribution/Simple/Setup/Haddock.hs
+++ b/Cabal/src/Distribution/Simple/Setup/Haddock.hs
@@ -584,6 +584,27 @@ haddockProjectOptions _showOrParseArgs =
       haddockProjectForeignLibs
       (\v flags -> flags{haddockProjectForeignLibs = v})
       trueArg
+  , option
+      ""
+      ["all", "haddock-all"]
+      "Run haddock for all targets"
+      ( \f ->
+          allFlags
+            [ haddockProjectExecutables f
+            , haddockProjectTestSuites f
+            , haddockProjectBenchmarks f
+            , haddockProjectForeignLibs f
+            ]
+      )
+      ( \v flags ->
+          flags
+            { haddockProjectExecutables = v
+            , haddockProjectTestSuites = v
+            , haddockProjectBenchmarks = v
+            , haddockProjectForeignLibs = v
+            }
+      )
+      trueArg
   , option
       ""
       ["internal"]
diff --git a/changelog.d/issue-10051 b/changelog.d/issue-10051
new file mode 100644
index 00000000000..b582fc2b619
--- /dev/null
+++ b/changelog.d/issue-10051
@@ -0,0 +1,4 @@
+synopsis: Added `--all` and `--haddock-all` switches to `haddock-project` subcommand
+packages: cabal-install
+issues: #10051
+prs: #2272