Tadayuki 'Taddy' Okada (born February 13, 1967) is a Japanese former professional Grand Prix motorcycle road racer.

[1][2] Okada won the 250cc All Japan Road Race Championship in three successive years from 1989 to 1991 for Honda.

[1][2] He missed several races in 1998 due to a wrist injury but bounced back in 1999 to finish third in the championship, with wins at Assen, Brno and Phillip Island.

[1] Going into the final round of the season he was second in points, but lost out to final-race winner Kenny Roberts Jr. After a largely unsuccessful 2000 he switched to the Superbike World Championship for 2001, without winning a race although taking three podium finishes and 8th overall.

He made a one-off wildcard appearance at the 2008 Italian Grand Prix at Mugello in June, finishing 14th, in the first race for the pneumatic valved Honda RC212V.