The 1986 NCAA Division I Tennis Championships were the 40th annual NCAA Division I Men's Tennis Championship and the 5th annual NCAA Division I Women's Tennis Championship to determine the national champions of NCAA Division I men's and women's collegiate tennis. Each championship featured a singles, doubles, and team championship.
The men's tournaments were played in Athens, Georgia, hosted by the University of Georgia, while the women's tournaments were held in Austin, Texas, hosted by the University of Texas. The men's and women's tournaments would not be held at the same site until 2006.
The men's team championship was won by Stanford, their eighth team national title. The Cardinal defeated Pepperdine in the final round, 5–2. The men's singles title was won by Dan Goldie from Stanford. The men's doubles title was won by Rick Leach and Tom Pawsat from USC.
The women's team championship was also won by Stanford, their second title in three years. This was the first time that the men's and women's team from the same school won championships in the same year. The Cardinal defeated rivals USC in the final round, 5–4. The women's singles title was won by Patty Fendick from Stanford. The women's doubles title was won by South African Lise Gregory and American Ronni Reis from Miami (FL).