Yukio Seki (? ??, Seki Yukio, August 29, 1921 – October 25, 1944) was a Japanese naval aviator of the Imperial Japanese Navy during World War II.
As a kamikaze pilot Lieutenant Seki led one of the three fighter groups of the second official kamikaze attack in World War II (the first official attack was an unsuccessful attempt led by Yoshiyasu Kuno on October 21, 1944).
Seki's final action took place on October 25, 1944, during the Battle of Leyte Gulf.
He led a unit of five bomb-armed Mitsubishi Zero fighters, crash-diving his plane deliberately into the USS St.
Lo's flight deck, being the first kamikazes to sink an enemy ship.