Kei Igarashi (五十嵐 圭、born May 7, 1980 in Jōetsu, Niigata, Japan) is a Japanese professional basketball player.

[1] Igarashi averaged 9 points and 3 assists per game for the host Japanese at the 2006 FIBA World Championship.

[2] Igarashi scored a team-high 18 points and added three assists in Japan's lone win at the tournament, a 78-61 preliminary round victory over Panama.

[3] In his most recent, national team appearance, Igarashi had a team-leading 3.6 assists per game, good for third best overall in the tournament.

[5] The popular Igarashi was also named to the JBL All-Star Game as the leading point guard vote-getter for the East.