Erwinna (/ɜːrˈwɪnə/ ur-WIN-ə) is an unincorporated community in Tinicum Township in Bucks County, Pennsylvania.

It is located approximately 40 miles (64 km) north as the crow flies of Center City Philadelphia and approximately 70 miles (110 km) west of New York City.

It is named after Colonel Arthur Erwin (also "Irwin"), who was a leader in the Bucks County Militia.

A concise biography of him has been created by the DAR Chapter bearing his name.

[2] Colonel Erwin is said to have supplied many of the boats which were used by George Washington and the Continental Army to cross the Delaware River en route to the Battle of Trenton on the morning of December 26, 1776.