The 1943 NCAA swimming and diving championships were contested in March 1943 at the Ohio State Natatorium at Ohio State University in Columbus, Ohio as the seventh annual NCAA-sanctioned swim meet to determine the team and individual national champions of men's collegiate swimming and diving among its member programs in the United States.

Hosts Ohio State topped the team standings, the Buckeyes' first title in program history. Ohio State had finished in second or third place in each of the previous six championships.

Team standings (H) = Hosts (DC) = Defending champions Italics = Debut appearance

Ohio State (H) 81 Michigan 47 Minnesota 13 Iowa 10 Pacific 8 Columbia 6 Northwestern Princeton Stanford Texas A&M 5 Washington Michigan State 4 Purdue 2 California 1 Penn State

DNQ: Yale (DC)

Individual events Swimming 50-yard freestyle Henry Kozlowski Northwestern 22.1 100-yard freestyle John Patten Michigan 52.0 220-yard freestyle Bill Smith Ohio State 2:09.8 440-yard freestyle Keo Nakama Ohio State 4:43.2 1,500-meter freestyle Keo Nakama Ohio State 19:18.6 150-yard backstroke Harry Holiday Michigan 1:33.5 200-yard butterfly Emmett Cashin Stanford 2:27.4 400-yard freestyle relay Harry HolidayJohn PattenMerton ChurchAce Cory Michigan (DC) 3:31.1 300-yard medley relay Harry HolidayIrving EinbinderJohn Patten Michigan 2:53.4

Diving One-meter diving Frank Dempsey (DC) Ohio State 141.12 Three-meter diving Frank Dempsey (DC) Ohio State 155.68

See also List of college swimming and diving teams

References