diff --git a/docs/cli.md b/docs/cli.md
index 42bfb181fc4..fb94f416ce1 100644
--- a/docs/cli.md
+++ b/docs/cli.md
@@ -164,6 +164,12 @@ You can also select optional dependency groups with the `--with` option.
 poetry install --with test,docs
 ```
 
+To install all dependency groups including the optional groups, use the ``--all-groups`` flag.
+
+```bash
+poetry install --all-groups
+```
+
 It's also possible to only install specific dependency groups by using the `only` option.
 
 ```bash
@@ -254,9 +260,10 @@ poetry install --compile
 * `--sync`: Synchronize the environment with the locked packages and the specified groups.
 * `--no-root`: Do not install the root package (your project).
 * `--no-directory`: Skip all directory path dependencies (including transitive ones).
-* `--dry-run`: Output the operations but do not execute anything (implicitly enables --verbose).
+* `--dry-run`: Output the operations but do not execute anything (implicitly enables `--verbose`).
 * `--extras (-E)`: Features to install (multiple values allowed).
-* `--all-extras`: Install all extra features (conflicts with --extras).
+* `--all-extras`: Install all extra features (conflicts with `--extras`).
+* `--all-groups`: Install dependencies from all groups (conflicts with `--only`, `--with`, and `--without`).
 * `--compile`: Compile Python source files to bytecode.
 * `--remove-untracked`: Remove dependencies not presented in the lock file. (**Deprecated**, use `--sync` instead)
 
@@ -295,7 +302,7 @@ You can do this using the `add` command.
 * `--without`: The dependency groups to ignore.
 * `--with`: The optional dependency groups to include.
 * `--only`: The only dependency groups to include.
-* `--dry-run` : Outputs the operations but will not execute anything (implicitly enables --verbose).
+* `--dry-run` : Outputs the operations but will not execute anything (implicitly enables `--verbose`).
 * `--lock` : Do not perform install (only update the lockfile).
 * `--sync`: Synchronize the environment with the locked packages and the specified groups.
 
@@ -456,7 +463,7 @@ about dependency groups.
 * `--platform`: Platforms for which the dependency must be installed.
 * `--source`: Name of the source to use to install the package.
 * `--allow-prereleases`: Accept prereleases.
-* `--dry-run`: Output the operations but do not execute anything (implicitly enables --verbose).
+* `--dry-run`: Output the operations but do not execute anything (implicitly enables `--verbose`).
 * `--lock`: Do not perform install (only update the lockfile).
 
 
@@ -482,7 +489,7 @@ about dependency groups.
 
 * `--group (-G)`: The group to remove the dependency from.
 * `--dev (-D)`: Removes a package from the development dependencies. (shortcut for `-G dev`)
-* `--dry-run` : Outputs the operations but will not execute anything (implicitly enables --verbose).
+* `--dry-run` : Outputs the operations but will not execute anything (implicitly enables `--verbose`).
 * `--lock`: Do not perform operations (only update the lockfile).
 
 
@@ -991,7 +998,7 @@ poetry self add artifacts-keyring
 * `--extras (-E)`: Extras to activate for the dependency. (multiple values allowed)
 * `--allow-prereleases`: Accept prereleases.
 * `--source`: Name of the source to use to install the package.
-* `--dry-run`: Output the operations but do not execute anything (implicitly enables --verbose).
+* `--dry-run`: Output the operations but do not execute anything (implicitly enables `--verbose`).
 
 ### self update
 
@@ -1009,7 +1016,7 @@ poetry self update
 #### Options
 
 * `--preview`: Allow the installation of pre-release versions.
-* `--dry-run`: Output the operations but do not execute anything (implicitly enables --verbose).
+* `--dry-run`: Output the operations but do not execute anything (implicitly enables `--verbose`).
 
 ### self lock
 
@@ -1063,7 +1070,7 @@ poetry self remove poetry-plugin-export
 
 #### Options
 
-* `--dry-run`: Outputs the operations but will not execute anything (implicitly enables --verbose).
+* `--dry-run`: Outputs the operations but will not execute anything (implicitly enables `--verbose`).
 
 ### self install
 
@@ -1082,4 +1089,4 @@ poetry self install --sync
 #### Options
 
 * `--sync`: Synchronize the environment with the locked packages and the specified groups.
-* `--dry-run`: Output the operations but do not execute anything (implicitly enables --verbose).
+* `--dry-run`: Output the operations but do not execute anything (implicitly enables `--verbose`).
diff --git a/src/poetry/console/commands/group_command.py b/src/poetry/console/commands/group_command.py
index f2ec9fbe52c..06dea92cc78 100644
--- a/src/poetry/console/commands/group_command.py
+++ b/src/poetry/console/commands/group_command.py
@@ -79,6 +79,12 @@ def activated_groups(self) -> set[str]:
                 for groups in self.option(key, "")
                 for group in groups.split(",")
             }
+
+        if self.option("all-groups"):
+            groups["with"] = self.poetry.package.dependency_group_names(
+                include_optional=True
+            )
+
         self._validate_group_options(groups)
 
         if groups["only"] and (groups["with"] or groups["without"]):
diff --git a/src/poetry/console/commands/install.py b/src/poetry/console/commands/install.py
index 4c7c7d24153..972d04d8f77 100644
--- a/src/poetry/console/commands/install.py
+++ b/src/poetry/console/commands/install.py
@@ -50,6 +50,7 @@ class InstallCommand(InstallerCommand):
             multiple=True,
         ),
         option("all-extras", None, "Install all extra dependencies."),
+        option("all-groups", None, "Install dependencies from all groups."),
         option("only-root", None, "Exclude all dependencies."),
         option(
             "compile",
@@ -104,12 +105,14 @@ def handle(self) -> int:
             return 1
 
         if self.option("only-root") and any(
-            self.option(key) for key in {"with", "without", "only"}
+            self.option(key) for key in {"with", "without", "only", "all-groups"}
         ):
             self.line_error(
                 "<error>The `<fg=yellow;options=bold>--with</>`,"
-                " `<fg=yellow;options=bold>--without</>` and"
-                " `<fg=yellow;options=bold>--only</>` options cannot be used with"
+                " `<fg=yellow;options=bold>--without</>`,"
+                " `<fg=yellow;options=bold>--only</>` and"
+                " `<fg=yellow;options=bold>--all-groups</>`"
+                " options cannot be used with"
                 " the `<fg=yellow;options=bold>--only-root</>`"
                 " option.</error>"
             )
@@ -122,6 +125,17 @@ def handle(self) -> int:
             )
             return 1
 
+        if (
+            self.option("only") or self.option("with") or self.option("without")
+        ) and self.option("all-groups"):
+            self.line_error(
+                "<error>You cannot specify `<fg=yellow;options=bold>--with</>`,"
+                " `<fg=yellow;options=bold>--without</>`, or"
+                " `<fg=yellow;options=bold>--only</>` when using"
+                " `<fg=yellow;options=bold>--all-groups</>`.</error>"
+            )
+            return 1
+
         extras: list[str]
         if self.option("all-extras"):
             extras = list(self.poetry.package.extras.keys())
diff --git a/tests/console/commands/test_install.py b/tests/console/commands/test_install.py
index 85162a31e5e..ae163df3ec2 100644
--- a/tests/console/commands/test_install.py
+++ b/tests/console/commands/test_install.py
@@ -104,6 +104,7 @@ def _project_factory(
         ("--without foo,bar", {MAIN_GROUP, "baz", "bim"}),
         (f"--without {MAIN_GROUP}", {"foo", "bar", "baz", "bim"}),
         ("--with foo,bar --without baz --without bim --only bam", {"bam"}),
+        ("--all-groups", {MAIN_GROUP, "foo", "bar", "baz", "bim", "bam"}),
         # net result zero options
         ("--with foo", {MAIN_GROUP, "foo", "bar", "baz", "bim"}),
         ("--without bam", {MAIN_GROUP, "foo", "bar", "baz", "bim"}),
@@ -285,9 +286,10 @@ def test_extras_conflicts_all_extras(
         "--without foo",
         "--with foo,bar --without baz",
         "--only foo",
+        "--all-groups",
     ],
 )
-def test_only_root_conflicts_with_without_only(
+def test_only_root_conflicts_with_without_only_all_groups(
     options: str,
     tester: CommandTester,
     mocker: MockerFixture,
@@ -300,11 +302,37 @@ def test_only_root_conflicts_with_without_only(
     assert tester.status_code == 1
     assert (
         tester.io.fetch_error()
-        == "The `--with`, `--without` and `--only` options cannot be used with"
+        == "The `--with`, `--without`, `--only` and `--all-groups` options cannot be used with"
         " the `--only-root` option.\n"
     )
 
 
+@pytest.mark.parametrize(
+    "options",
+    [
+        "--with foo",
+        "--without foo",
+        "--with foo,bar --without baz",
+        "--only foo",
+    ],
+)
+def test_all_groups_conflicts_with_only_with_without(
+    options: str,
+    tester: CommandTester,
+    mocker: MockerFixture,
+) -> None:
+    assert isinstance(tester.command, InstallerCommand)
+    mocker.patch.object(tester.command.installer, "run", return_value=0)
+
+    tester.execute(f"{options} --all-groups")
+
+    assert tester.status_code == 1
+    assert (
+        tester.io.fetch_error()
+        == "You cannot specify `--with`, `--without`, or `--only` when using `--all-groups`.\n"
+    )
+
+
 @pytest.mark.parametrize(
     ("options", "valid_groups", "should_raise"),
     [