John Hammond McElfresh (May 27, 1796 – August 4, 1841) was an American politician from Maryland.

He studied medicine under Dr. L. T. Hammond of Anne Arundel County.

[1][2] After graduating as a physician, McElfresh practiced medicine in Frederick until 1822.

[2] McElfresh served as a member of the Maryland House of Delegates in 1830.

[2] In 1831, Governor Daniel Martin appointed McElfresh as a colonel on his staff.