Percival Proctor Baxter (November 22, 1876 – June 12, 1969) was a Republican governor of the U.S. state of Maine who served from 1921 to 1925.

He was born in Portland and was a member of the Maine House of Representatives during 1905 and during 1917–1920. He served in the Maine State Senate during 1909–1910. He also served as a delegate to the Republican National Convention in 1920, 1924, and 1928.

Perhaps his most well-known contribution to the state was in the form of Baxter State Park, the crown jewel of the Maine State Park system and home to Maine's tallest mountain: Mt. Katahdin. He pushed for many years for the state to buy the land, and eventually through a combination of his own personal resources and fundraising was able to purchase most of what is now Baxter State Park and cede it to the state.