Gridiron football •
Ken Johnson (defensive end, born 1947), American football defensive end for the Cincinnati Bengals, played 1970–1977 •
Ken Johnson (defensive end, born 1955), American football defensive end for the Buffalo Bills and the Kansas City Chiefs •
Kenny Johnson (defensive back) (born 1958), American football safety for the Atlanta Falcons and Houston Oilers •
Kenneth Johnson (American football) (born 1963), American football defensive back for the 1987 Green Bay Packers •
Ken "Pinto Ron" Johnson (born 1957), Buffalo Bills fan •
Ken Johnson (quarterback) (born 1951), gridiron football quarterback, primarily in the CFL (1978–1982) •
Kenny Johnson (wide receiver) (born 2005), American football player
Basketball •
Ken Johnson (basketball, born 1962), American basketball player for Michigan State and the Portland Trail Blazers •
Ken Johnson (basketball, born 1978), American basketball player for Ohio State and the Miami Heat •
Kenny Johnson (basketball), American basketball coach
Baseball •
Ken Johnson (left-handed pitcher) (1923–2004), American baseball player, played 1947–1952 •
Ken Johnson (right-handed pitcher) (1933–2015), American baseball player, 1958–1970; pitched a no-hitter in 1964 game he lost
Other sports •
Ken Johnson (footballer) (1931–2011), English-born association footballer who played for Hartlepools United •
Ken Johnson (racing driver) (born 1962), American CART driver 1988–1989 • Ken Johnson or
Slick (wrestling) (born 1957), American professional wrestling manager •
Ken Johnson (athlete) (1928–2015), British distance runner •
Ken Johnson (sport shooter) (born 1968), American sport shooter •
Kenneth Johnson (cricketer) (born 1923), South African cricketer ==Other==