Mount Plymouth or Mount Osorno is a conspicuous peak rising to 520m (1,710feet) in the northeast extremity of Dryanovo Heights, Greenwich Island in the South Shetland Islands, Antarctica. The peak has precipitous and partly ice-free northern slopes, and surmounts Teteven Glacier to the northwest, Quito Glacier to the northeast and Traub Glacier to the southeast.
The feature was charted by the Discovery Investigations and named after the city of Plymouth, England.
The peak is located at -62.4622°N -59.8163°W which is 3.1km (01.9miles) east by north of Sevtopolis Peak, 5.1km (03.2miles) west-southwest of Spark Point, 4.47km (02.78miles) north-northeast of Tile Ridge and 4.9km (03miles) northeast of Lloyd Hill (British mapping in 1935 and 1968, Chilean in 1947, Argentine in 1953, and Bulgarian in 2005 and 2009).
