Frederick Burdett Warder (March 19, 1904 – February 1, 2000) was a highly decorated United States Navy submarine officer during World War II.

[1]: 74  In 1942, during the last two days of Seawolf's fourth patrol, having become frustrated with the failures of the Mark 14 torpedo, Warder led Seawolf to abnormally close range attacks on three Imperial Japanese Navy (IJN) cruisers, earning him the nickname "Fearless Freddie", in an effort to ensure successful hits with the faulty torpedoes.

[1]: 23  Warder was awarded his first Navy Cross for the entirety of Seawolf's fourth patrol (February 25 to April 1, 1942).

[1]: 25–31  In 1942, during Seawolf's seventh patrol, Warder decided to make a dangerous real-world test, keeping Seawolf stationary for an abnormally prolonged period during an attack on November 3,in order to send distinct torpedo barrages against a Japanese vessel, proving that the Mark 14 was missing the target while a second shot, with an older Mark 10 torpedo, hit the target.

[1]: 23  Warder would win his second Navy Cross for Seawolf's seventh war patrol (October 7 to December 1, 1942), during which 16,810 tons of Japanese vessels were sunk,[3] part of the total tonnage Seawolf sunk to become the most successful Sargo-class submarine of World War II.