The Kohat Tunnel (, Kohat Sarang) is a highway tunnel under the Khigana Mountains between Kohat District of Khyber Pakhtunkhwa and Frontier Region Kohat in the Federally Administered Tribal Areas of Pakistan. The tunnel carries northbound and southbound traffic along N-55 National Highway (Indus Highway) under the Kohat Pass. The tunnel is also referred to as the Pak-Japan Friendship Tunnel, as the tunnel was constructed in assistance with the Economic Cooperation Fund of Japan.