The Baxter Summer Home is a historic house on Mackworth Island, in Casco Bay off the coast of Falmouth, Maine.

[3] The house is a 2½ story masonry structure, built out of dark red brick, with a green terracotta tile roof and a fieldstone foundation.

The main entrance faces east, and is flanked by sidelights, with a transom window above which has stained glass highlights in a sailing motif.

[2] Mackworth Island was purchased in 1885 by James Phinney Baxter, a six-time mayor of Portland and a leading historian and businessman of the period.

He retained Portland architect Frederick Thompson to design this house, which was built in 1917–18, replacing an earlier wood-frame structure (since demolished).