State Route 25 (SR 25) is part of the system of numbered highways in Maine. It runs for 42.4 miles (68.2 km) across the south central part of the state. SR 25 begins at the New Hampshire border near Porter, where it continues west as New Hampshire Route 25 (NH 25). Its eastern terminus is in downtown Portland at the intersection of Park Avenue and State Street. Administratively, it shares a terminus with SR 22 and SR 77.