Justin Colfax Morgan (July 8, 1900 – May 24, 1959) was an American lawyer and politician from New York.
He was born on July 8, 1900, in Buffalo, New York. He graduated A.B. from Colgate University in 1921, and LL.B. from the University of Buffalo Law School in 1924. He began to practice law in Buffalo in 1925. He was an Assistant United States Attorney for the Western District of New York from 1928 to 1935.
He was a Councilman of the Town of Tonawanda from 1934 to 1940; and a member of the New York State Assembly from 1941 to 1956, sitting in the 163rd, 164th, 165th, 166th, 167th, 168th, 169th and 170th New York State Legislature.
On January 25, 1956, Morgan was nominated by President Dwight D. Eisenhower to the seat on the United States District Court for the Western District of New York vacated by John Knight. Morgan was confirmed by the United States Senate on March 6, 1956, and received his commission on March 8, 1956. He served in that capacity until his death, in 1959.