Philip Key (1750 – January 4, 1820) was an American congressional representative from Maryland. Key was the son of Dr. John Key and was probably born on his father's estate near Leonardtown, Maryland. His father died in 1755, leaving his grandfather and later his uncles to act as his guardians. He pursued an academic course in England. 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 died in Chaptico, Maryland, and is likely interred in the churchyard there.