Gemini 5 (officially Gemini V) was a 1965 manned spaceflight in NASA's Gemini program. It was the third manned Gemini flight, the eleventh manned American flight, and the nineteenth spaceflight of all time, including two X-15 flights above 100 kilometers (54 nmi). It was also the first time an American manned space mission held the world record for duration, set on August 26, 1965, by breaking the Soviet Union's previous record set by Vostok 5 in 1963.