Fred Dickinson Letts (April 26, 1875 – January 19, 1965) was a United States representative from Iowa, and a United States district judge of the United States District Court for the District of Columbia.

[1] He attended Columbia University, then received a Bachelor of Science degree in 1897 from Parsons College in Fairfield, Iowa, and a Bachelor of Laws in 1899 from the University of Iowa College of Law and was admitted to the bar that year.

[2] Letts was elected as a Republican from Iowa's 2nd congressional district to the United States House of Representatives of the 69th, 70th, and 71st United States Congresses, serving from March 4, 1925, until March 3, 1931.

[1] Letts received a recess appointment from President Herbert Hoover on May 5, 1931, to an Associate Justice seat on the Supreme Court of the District of Columbia (Associate Justice of the District Court of the United States for the District of Columbia from June 25, 1936, Judge of the United States District Court for the District of Columbia from June 25, 1948) vacated by Associate Justice Wendell Philips Stafford.

[1] Letts was a cousin of former Iowa United States Senator and United States Representative Lester J. Dickinson of Algona, Iowa, who was also serving in the United States House of Representatives during Lett's two terms.