diff --git a/changes/unreleased.md b/changes/unreleased.md
index 373eb99..2aa77f0 100644
--- a/changes/unreleased.md
+++ b/changes/unreleased.md
@@ -1,2 +1,5 @@
+## Changes
 
-No changes.
+- Support relative filesystem world paths in workspace configs.
+    - Default workspace configs emit relative filesystem world paths for project and session worlds.
+    - Filesystem world resolution expands `~` and resolves relative paths against the workspace root.
diff --git a/donna/workspaces/config.py b/donna/workspaces/config.py
index d645092..552e726 100644
--- a/donna/workspaces/config.py
+++ b/donna/workspaces/config.py
@@ -46,7 +46,7 @@ def _default_sources() -> list[SourceConfig]:
     ]
 
 
-def _create_default_worlds(project_dir: pathlib.Path) -> list[WorldConfig]:
+def _create_default_worlds() -> list[WorldConfig]:
     return [
         WorldConfig.model_validate(
             {
@@ -63,7 +63,7 @@ def _create_default_worlds(project_dir: pathlib.Path) -> list[WorldConfig]:
                 "kind": "donna.lib.worlds.filesystem",
                 "readonly": True,
                 "session": False,
-                "path": pathlib.Path.home() / DONNA_DIR_NAME / DONNA_WORLD_HOME_DIR_NAME,
+                "path": f"~/{DONNA_DIR_NAME}/{DONNA_WORLD_HOME_DIR_NAME}",
             }
         ),
         WorldConfig.model_validate(
@@ -72,7 +72,7 @@ def _create_default_worlds(project_dir: pathlib.Path) -> list[WorldConfig]:
                 "kind": "donna.lib.worlds.filesystem",
                 "readonly": False,
                 "session": False,
-                "path": project_dir / DONNA_DIR_NAME / DONNA_WORLD_PROJECT_DIR_NAME,
+                "path": pathlib.Path(DONNA_DIR_NAME) / DONNA_WORLD_PROJECT_DIR_NAME,
             }
         ),
         WorldConfig.model_validate(
@@ -81,14 +81,14 @@ def _create_default_worlds(project_dir: pathlib.Path) -> list[WorldConfig]:
                 "kind": "donna.lib.worlds.filesystem",
                 "readonly": False,
                 "session": True,
-                "path": project_dir / DONNA_DIR_NAME / DONNA_WORLD_SESSION_DIR_NAME,
+                "path": pathlib.Path(DONNA_DIR_NAME) / DONNA_WORLD_SESSION_DIR_NAME,
             }
         ),
     ]
 
 
 def _default_worlds() -> list[WorldConfig]:
-    return _create_default_worlds(project_dir())
+    return _create_default_worlds()
 
 
 class Config(BaseEntity):
diff --git a/donna/workspaces/worlds/filesystem.py b/donna/workspaces/worlds/filesystem.py
index 300a05a..a537ee5 100644
--- a/donna/workspaces/worlds/filesystem.py
+++ b/donna/workspaces/worlds/filesystem.py
@@ -195,9 +195,15 @@ def construct_world(self, config: "WorldConfig") -> World:
         if path_value is None:
             raise ValueError(f"World config '{config.id}' does not define a filesystem path")
 
+        from donna.workspaces.config import project_dir
+
+        path = pathlib.Path(path_value).expanduser()
+        if not path.is_absolute():
+            path = project_dir() / path
+
         return World(
             id=config.id,
-            path=pathlib.Path(path_value),
+            path=path.resolve(),
             readonly=config.readonly,
             session=config.session,
         )