Daisuke Enomoto

is a Japanese businessman and former livedoor executive who hoped to become the fourth space tourist. He had trained at Star City, Moscow in Russia to fly with two members of Expedition 14 on board Soyuz TMA-9, which was launched on September 18, 2006.

However, on August 21, 2006, a Russian Federal Space Agency spokesman announced that Enomoto was "deemed not ready to fly for exclusively medical reasons", although he hinted that Enomoto might recover and join a later mission. His replacement on this particular flight was Iranian-American businesswoman Anousheh Ansari.

Enomoto lodged a lawsuit against Virginia-based Space Adventures in which he hoped to reclaim the $21 million he paid the company over a two-year span. During the lawsuit, it was revealed that the "medical reason" was chronic kidney stones. Space Adventures claims it advised Enomoto to treat the kidney stones aggressively and when he did not, they had to disqualify him from spaceflight. Enomoto claims that he was misled about the kidney stones issue, His planned experiment was to put together one or more Gundam models in zero gravity.