Fusao Sekiguchi (関口房朗) (born December 20, 1935, in Amagasaki, Hyogo, Japan) is a businessman and Thoroughbred horse racing enthusiast. He was the founder and CEO of Meitec [ja] in Nagoya before also founding Venture Safe Net, Inc (VSN, Inc) [ja] of Tokyo.

Fusao Sekiguchi
関口房朗
Sekiguchi at the 2006 Queen Elizabeth II Cup
Born	(1935-12-20) December 20, 1935 (age 88)
Nationality	Japanese
Known for	Founder of Meitec Corporation and VSN Owner of successful racehorses
Children	2

The owner of a number of racehorses, the most notable of which was 2000 Kentucky Derby winner Fusaichi Pegasus whom he sold for a reported US$64 million to Ireland's Coolmore Stud. Other successful thoroughbred horses Sekiguchi has owned include Tokyo Yushun winner Fusaichi Concorde and Fusaichi Pandora, winner of the 2006 Q.E. II Cup.