Philip Key (1750 – January 4, 1820) was an American congressional representative from Maryland.

His father died in 1755, leaving his grandfather and later his uncles to act as his guardians.

Key eventually returned to Maryland and engaged in farming, he then began to study law and was later admitted to the bar and practiced.

Key served in the Maryland House of Delegates in 1773, he then became a member of the committee of correspondence for St. Mary's County, in 1774.

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