Green Tree is a borough in Allegheny County, Pennsylvania, United States.

Green Tree is connected to Pittsburgh via the Fort Pitt Tunnel.

Settled in 1793, the area stayed rural until the late 1800s, with paintings of the time showing farmland and a vineyard.

[6] According to the United States Census Bureau, the borough has a total area of 2.1 square miles (5.4 km2), all land.

Wexford Health Sources has its headquarters in Foster Plaza Two in Green Tree.

[13][14] The U.S. Department of the Interior's Office of Surface Mining has its Appalachian Regional Coordination Center, including the Pittsburgh Field office and the National Mine Map Repository, in Three Parkway Center in Green Tree.