John McGuinness is the name of: John McGuinness (baseball) (1857–1916), Irish-born baseball player Seán McGuinness (died 1978), also known as John McGuinness, Irish Republican who was elected to Dáil Éireann in 1923 but did not take his seat and was later disqualified John McGuinness (politician) (born 1955), Irish Fianna Fáil Party politician, TD for Carlow-Kilkenny 1997– John McGuinness (lawn bowls) (born 1967), English lawn bowler John McGuinness (motorcycle racer) (born 1972), English professional motorcycle racer and 24-time winner of the Isle of Man TT John Martin McGuinness (1950–2017), Irish republican Sinn Féin politician