The Warner Trail is a 30 mi (48 km) New England hiking trail which extends from Diamond Hill in the northeast corner of Rhode Island northeast through Norfolk County, Massachusetts to Canton, 13 miles (21 km) south of Boston.

Its route winds through what has become a primarily suburban landscape punctuated by significant pockets of rural conservation land and state forest.

The terrain is hilly and occasionally rugged with ledges of metamorphic rock and granite; forest cover is of the oak-hickory type.

The trail passes through Cumberland, Rhode Island and the Massachusetts towns of Canton, Sharon, Foxboro, Wrentham, and Plainville.

From south to north, the trail visits a number of high points with ledge-top views including Diamond Hill 481 feet (147 m), also known for its defunct ski area; Sunset Rock, Wampum Rock, Knuckup Hill, Outlook Rock, Pinnacle Hill, Goat Rock, High Rock, Pierce Hill, Allen Ledge, Bluff Head, and Moose Hill, the trail's high point.