Federal Route 91, or Jalan Kluang-Kota Tinggi, is the main federal road in Johor, Malaysia. It connects Kluang to Kota Tinggi.
The route starts at Kluang and ends at Kota Tinggi via Gunung Lambak and Bandar Tenggera.
At most sections, the Federal Route 91 was built under the JKR R5 road standard, allowing maximum speed limit of up to 90 km/h.
The entire route is located in Johor.