Mount Robert Barron is a 3,475-foot (1,059 m) elevation mountain summit located on Admiralty Island in the Alexander Archipelago, in the U.S. state of Alaska. It is the highest point on the island's Mansfield Peninsula, and is situated 16 mi (26 km) west-southwest of Juneau, on land managed by Tongass National Forest. Although modest in elevation, relief is significant since the peak rises up from tidewater at Funter Bay on Lynn Canal in less than two miles, and from Stephens Passage to the east in less than three miles.