diff --git a/crates/ruff_server/src/fix.rs b/crates/ruff_server/src/fix.rs
index fa5607f972228..f94e8c138610b 100644
--- a/crates/ruff_server/src/fix.rs
+++ b/crates/ruff_server/src/fix.rs
@@ -1,11 +1,12 @@
 use ruff_linter::{
     linter::{FixerResult, LinterResult},
+    packaging::detect_package_root,
     settings::{flags, types::UnsafeFixes, LinterSettings},
     source_kind::SourceKind,
 };
 use ruff_python_ast::PySourceType;
 use ruff_source_file::LineIndex;
-use std::{borrow::Cow, path::Path};
+use std::borrow::Cow;
 
 use crate::{
     edit::{Replacement, ToRangeExt},
@@ -14,11 +15,23 @@ use crate::{
 
 pub(crate) fn fix_all(
     document: &crate::edit::Document,
+    document_url: &lsp_types::Url,
     linter_settings: &LinterSettings,
     encoding: PositionEncoding,
 ) -> crate::Result<Vec<lsp_types::TextEdit>> {
     let source = document.contents();
 
+    let document_path = document_url
+        .to_file_path()
+        .expect("document URL should be a valid file path");
+
+    let package = detect_package_root(
+        document_path
+            .parent()
+            .expect("a path to a document should have a parent path"),
+        &linter_settings.namespace_packages,
+    );
+
     let source_type = PySourceType::default();
 
     // TODO(jane): Support Jupyter Notebooks
@@ -35,8 +48,8 @@ pub(crate) fn fix_all(
         result: LinterResult { error, .. },
         ..
     } = ruff_linter::linter::lint_fix(
-        Path::new("<filename>"),
-        None,
+        &document_path,
+        package,
         flags::Noqa::Enabled,
         UnsafeFixes::Disabled,
         linter_settings,
diff --git a/crates/ruff_server/src/lint.rs b/crates/ruff_server/src/lint.rs
index 355460913f1fb..02475ad0b7b0a 100644
--- a/crates/ruff_server/src/lint.rs
+++ b/crates/ruff_server/src/lint.rs
@@ -1,11 +1,10 @@
 //! Access to the Ruff linting API for the LSP
 
-use std::path::Path;
-
 use ruff_diagnostics::{Applicability, Diagnostic, DiagnosticKind, Fix};
 use ruff_linter::{
     directives::{extract_directives, Flags},
     linter::{check_path, LinterResult, TokenSource},
+    packaging::detect_package_root,
     registry::AsRule,
     settings::{flags, LinterSettings},
     source_kind::SourceKind,
@@ -40,12 +39,24 @@ pub(crate) struct DiagnosticFix {
 
 pub(crate) fn check(
     document: &crate::edit::Document,
+    document_url: &lsp_types::Url,
     linter_settings: &LinterSettings,
     encoding: PositionEncoding,
 ) -> Vec<lsp_types::Diagnostic> {
     let contents = document.contents();
     let index = document.index().clone();
 
+    let document_path = document_url
+        .to_file_path()
+        .expect("document URL should be a valid file path");
+
+    let package = detect_package_root(
+        document_path
+            .parent()
+            .expect("a path to a document should have a parent path"),
+        &linter_settings.namespace_packages,
+    );
+
     let source_type = PySourceType::default();
 
     // TODO(jane): Support Jupyter Notebooks
@@ -71,8 +82,8 @@ pub(crate) fn check(
         data: (diagnostics, _imports),
         ..
     } = check_path(
-        Path::new("<filename>"),
-        None,
+        &document_path,
+        package,
         &locator,
         &stylist,
         &indexer,
diff --git a/crates/ruff_server/src/server/api/diagnostics.rs b/crates/ruff_server/src/server/api/diagnostics.rs
index ecd153aa5fd84..ba08cdf776969 100644
--- a/crates/ruff_server/src/server/api/diagnostics.rs
+++ b/crates/ruff_server/src/server/api/diagnostics.rs
@@ -6,6 +6,7 @@ pub(super) fn generate_diagnostics(snapshot: &DocumentSnapshot) -> Vec<lsp_types
     if snapshot.client_settings().lint() {
         crate::lint::check(
             snapshot.document(),
+            snapshot.url(),
             snapshot.settings().linter(),
             snapshot.encoding(),
         )
diff --git a/crates/ruff_server/src/server/api/requests/code_action_resolve.rs b/crates/ruff_server/src/server/api/requests/code_action_resolve.rs
index c1a123f904a36..bd23b4dcab6df 100644
--- a/crates/ruff_server/src/server/api/requests/code_action_resolve.rs
+++ b/crates/ruff_server/src/server/api/requests/code_action_resolve.rs
@@ -95,17 +95,18 @@ pub(super) fn resolve_edit_for_fix_all(
     tracker.set_edits_for_document(
         url.clone(),
         version,
-        fix_all_edit(document, linter_settings, encoding)?,
+        fix_all_edit(document, url, linter_settings, encoding)?,
     )?;
     Ok(tracker.into_workspace_edit())
 }
 
 pub(super) fn fix_all_edit(
     document: &crate::edit::Document,
+    document_url: &types::Url,
     linter_settings: &LinterSettings,
     encoding: PositionEncoding,
 ) -> crate::Result<Vec<types::TextEdit>> {
-    crate::fix::fix_all(document, linter_settings, encoding)
+    crate::fix::fix_all(document, document_url, linter_settings, encoding)
 }
 
 pub(super) fn resolve_edit_for_organize_imports(
@@ -120,13 +121,14 @@ pub(super) fn resolve_edit_for_organize_imports(
     tracker.set_edits_for_document(
         url.clone(),
         version,
-        organize_imports_edit(document, linter_settings, encoding)?,
+        organize_imports_edit(document, url, linter_settings, encoding)?,
     )?;
     Ok(tracker.into_workspace_edit())
 }
 
 pub(super) fn organize_imports_edit(
     document: &crate::edit::Document,
+    document_url: &types::Url,
     linter_settings: &LinterSettings,
     encoding: PositionEncoding,
 ) -> crate::Result<Vec<types::TextEdit>> {
@@ -138,5 +140,5 @@ pub(super) fn organize_imports_edit(
     .into_iter()
     .collect();
 
-    crate::fix::fix_all(document, &linter_settings, encoding)
+    crate::fix::fix_all(document, document_url, &linter_settings, encoding)
 }
diff --git a/crates/ruff_server/src/server/api/requests/execute_command.rs b/crates/ruff_server/src/server/api/requests/execute_command.rs
index 4db24eb869fc3..6e2933a44a119 100644
--- a/crates/ruff_server/src/server/api/requests/execute_command.rs
+++ b/crates/ruff_server/src/server/api/requests/execute_command.rs
@@ -64,6 +64,7 @@ impl super::SyncRequestHandler for ExecuteCommand {
                 Command::FixAll => {
                     let edits = super::code_action_resolve::fix_all_edit(
                         snapshot.document(),
+                        snapshot.url(),
                         snapshot.settings().linter(),
                         snapshot.encoding(),
                     )
@@ -83,6 +84,7 @@ impl super::SyncRequestHandler for ExecuteCommand {
                 Command::OrganizeImports => {
                     let edits = super::code_action_resolve::organize_imports_edit(
                         snapshot.document(),
+                        snapshot.url(),
                         snapshot.settings().linter(),
                         snapshot.encoding(),
                     )