Tsuyoshi Fukui (福井 烈 Fukui Tsuyoshi, born 22 June 1957 in Moji, Fukuoka Prefecture) is a retired tour and Japan Davis Cup team tennis player. Fukui holds the record for the most singles win for the Japanese in Davis Cup, with 26. On tour, he won two Challenger tennis events in singles and earned a career-high singles ranking of World No. 177, in January 1983.
Fukui won the 1983 Tokyo Challenger and 1985 Nagoya Challenger. His best results in a Grand Prix tennis event was reaching the third round of the 1980 Tokyo Outdoor (now the Rakuten Japan Open Tennis Championships). The only Grand Prix events he ever played in the main draw of were the Tokyo Outdoor, Tokyo Indoor, and once in each the Taipei Grand Prix and Hong Kong Grand Prix. The Japan No. 1 for much of the late 1970s and early 1980s, Fukui only defeated a non-Japanese opponent four times (Haroon Ismail, Bruce Kleege, Kim Warwick, Mike Estep, Mark Wooldridge, and Jon Levine) in compiling a career singles win-lose record of 10 wins, 26 losses for Grand Prix events.
Fukui lost to Tony Roche at the 1978 Tokyo Outdoor 7-5, 4-6, 1-6; Ilie Năstase at the 1978 Tokyo Indoor 1-6, 4-6; Yannick Noah at the 1979 Tokyo Indoor 2-6, 5-7; Björn Borg at the 1980 Tokyo Indoor 2-6, 2-6; Eliot Teltscher at the 1981 Tokyo Outdoor 1-6, 2-6; John McEnroe at the 1981 Tokyo Indoor 3-6, 2-6; Miloslav Mečíř, Sr. at the 1987 Tokyo Outdoor 5-7, 1-6; and Stefan Edberg at the 1987 Tokyo Indoor 5-7, 2-6. His best win was the one over Kim Warwick, a top 50 player, at the 1982 Hong Kong Grand Prix, 7-5, 1-6, 7-6.