State Route 547 (SR 547, OH 547) is an east–west state highway in north central Ohio, a U.S. state. The highway's western terminus is at State Route 269 approximately 4.5 miles (7.2 km) south of Bellevue. The eastern terminus of State Route 547 is at the duplex of U.S. Route 20 and State Route 18 in downtown Monroeville.

Located in western Huron County, State Route 547 traverses primarily rural terrain excepting the easternmost stretch of the highway through Monroeville. It came into being in the late 1930s, and has not seen any significant changes since that time. State Route 547's western endpoint is situated on the Seneca-Huron County Line, which serves as the western boundary of the historic Firelands and Connecticut Western Reserve.

The entirety of State Route 547 is situated within Huron County. No portion of this route is included as a part of the National Highway System.

State Route 547 begins at the intersection of State Route 269 and Township Road 186 on the Seneca-Huron County Line approximately 4.5 miles (7.2 km) south of Bellevue. The vast majority of State Route 547's path is in rural farm country, passing a house here and there along the way. Heading due east from the State Route 269 intersection into Sherman Township, the state highway arrives at its junction with State Route 4 just 0.75 miles (1.21 km) from its starting point. East of there, the route turns northeasterly, and as it passes a large clump of trees that abut the north side of the road, it meets Hayman Road. Crossing into Lyme Township, State Route 547 next crosses Section Line Road. Continuing northeast through the vast farmland, the state highway passes intersections with Dogtown Road, Sand Hill Road and Townline Road, just past which the route enters Ridgefield Township. State Route 547 then crosses T-intersections with Williams Road and Farr Road, after which it enters the village of Monroeville. At that point, the highway picks up the name Monroe Street, and passes into a backdrop that is primarily residential. After crossing the Wheeling and Lake Erie Railway tracks, the highway arrives at its junction with State Route 99, a four-way stop intersection. State Route 547 continues easterly through the residential portion of Monroeville prior to entering the central business district, where it comes to an end at the signalized intersection it has with the duplex of U.S. Route 20 and State Route 18.

State Route 547 made its debut in 1937 along the routing that it occupies to this day between State Route 269 and the duplex of U.S. Route 20 and State Route 18. The highway has not experienced any major changes to its routing since it was first designated.

The entire route is in Huron County.

As State Route 547 follows narrow two-lane Monroe Street through Monroeville between State Route 99 and U.S. Route 20/State Route 18, trucks are prohibited from this stretch of highway. Consequently, a Truck State Route 547 is signed, starting from the junction of State Route 547 and State Route 99, following State Route 99 north to U.S. Route 20/State Route 18, then following the duplex southeasterly to the downtown Monroeville intersection marking State Route 547's eastern terminus, which doubles as the truck route's endpoint.