Haines Memorial State Park is public recreation area in the town of Barrington on the northeastern side of Narragansett Bay, six miles (9.7 km) south of East Providence, Rhode Island.

The state park offers picnicking, play fields, fishing and boating facilities, and is a stop on the East Bay Bike Path.

[3] Haines purchased the Humphrey Farm in 1909, a "wooded retreat" of 83 acres, and lived there until his sudden death the following year.

"[1][3] Initially, the park featured picnic groves and ball fields, and was accessible by train or trolley from Bristol.

In the 1930s, the Civilian Conservation Corps sculpted the beach for the enhanced enjoyment of bathers, built fireplaces and a boat ramp, and created a pedestrian bridge that connected the park with Crescent Park until it was destroyed in the 1938 New England Hurricane.