diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 6519a849852fc..0f1caa607d663 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -20,3 +20,7 @@ repos:
      -  id: mypy
         files: sklearn/
         additional_dependencies: [pytest==6.2.4]
+-   repo: https://github.com/PyCQA/isort
+    rev: 5.10.1
+    hooks:
+    -   id: isort
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 8143cb7e04452..6a694bf1ba9d5 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -34,11 +34,14 @@ jobs:
         versionSpec: '3.9'
     - bash: |
         # Include pytest compatibility with mypy
-        pip install pytest flake8 mypy==0.782 black==22.3.0
+        pip install pytest flake8 mypy==0.782 black==22.3.0 isort
       displayName: Install linters
     - bash: |
         black --check --diff .
       displayName: Run black
+    - bash: |
+        isort --check --diff .
+      displayName: Run isort
     - bash: |
         ./build_tools/circle/linting.sh
       displayName: Run linting
diff --git a/pyproject.toml b/pyproject.toml
index 9b38a78966358..ce4a37113e528 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -33,3 +33,6 @@ exclude = '''
   | asv_benchmarks/env
 )/
 '''
+
+[tool.isort]
+profile = "black"
diff --git a/sklearn/model_selection/_split.py b/sklearn/model_selection/_split.py
index d2a0b5e1fc329..d08eeba021537 100644
--- a/sklearn/model_selection/_split.py
+++ b/sklearn/model_selection/_split.py
@@ -18,10 +18,10 @@
 from math import ceil, floor
 import numbers
 from abc import ABCMeta, abstractmethod
-from inspect import signature
 
-import numpy as np
 from scipy.special import comb
+import numpy as np
+from inspect import signature
 
 from ..utils import indexable, check_random_state, _safe_indexing
 from ..utils import _approximate_mode