Alfred Langdon Elwyn (9 July 1804 – 15 March 1884) was an American medical doctor, writer and philanthropist.

He read medicine with Dr. John Gorham in Boston and in 1826 traveled to London, Edinburgh and Paris.

He returned to the United States in 1829[1] and received his medical degree from the University of Pennsylvania in 1831 but never practiced medicine.

[3] On January 31, 1832, he married Mary Middleton, daughter of James Mease and granddaughter of Pierce Butler of South Carolina.

Bridgman was studying at the South Boston Institute for the Blind, and while there Elwyn visited a classroom for mentally disabled children run by teacher James Richards.

[1] He published several books including the poem Bonaparte, Glossary of Supposed Americanisms, Letters to the Hon.

The portrait was owned by Edward L. Carey and hung in the Academy of Fine Arts in Philadelphia.