Nicholas Lee Katt (born May 11, 1970) is an American actor known for his role as unorthodox teacher Harry Senate on David E. Kelley's Fox drama Boston Public. He has costarred in many movies and received critical praise for performances in The Limey and SubUrbia. Many of the characters Katt plays are overtly prickly, followed by such roles as an irascible motorhead in Dazed and Confused, an ill-fated child rapist in A Time to Kill and an embittered business rival in Boiler Room. He was also originally cast to star in the ABC Spring 2006 replacement series The Evidence, but was replaced by Rob Estes. Katt was a child actor as well, appearing in Gremlins and as Marc Singer's son on the TV series V.

Katt was born in South Dakota.

Nicky Katt has been acting since the age of 7, when he appeared on the TV series "CHiPs" (1977) in 1977. He continued to work steadily through the 1980s on shows like "Quincy M.E." (1976), "Father Murphy" (1981), and "V" (1984) but did not fall into the trap of many child actors who became identified with one famous role because his child roles were as guest spots or, as in the case of "Herbie, the Love Bug" (1982), were canceled early on, or can't get work as adults and allow their lives to fall to pieces. In a way, Katt has had two careers. The one as the child actor of the late 1970s and early 1980s, and as the character actor of the 1990s who so often played the bully or thug. Extremely talented and at ease in front of a camera in the medium of either television or feature film, Katt has had a very impressive body of work for someone of his age and looks to gain much in the way of future stardom as the series "Boston Public" (2000) clearly exhibits his leading-man potential.