Mendon Morrill (September 18, 1902 – March 12, 1961) was a United States federal judge.
Born in Worcester, Massachusetts, Morrill graduated from Harvard University in 1923 and received an LL.B. from Harvard Law School in 1926. He was in private practice in Massachusetts and in Paterson, New Jersey, and served in the United States Army.
On March 25, 1958, Morrill was nominated by President Dwight D. Eisenhower to a seat on the United States District Court for the District of New Jersey vacated by Alfred E. Modarelli. Morrill was confirmed by the United States Senate on April 22, 1958, and received his commission on April 23, 1958. Morrill served in that capacity until his death, in 1961.