Ratomir "Rato" Tvrdić (14 September 1943 – 20 August 2024) was a Croatian professional basketball player.

Tvrdić played club basketball with the Croatian team KK Split.

With Split, he won two national Yugoslav League championships (1971, 1977), three national Yugoslav Cups (1972, 1974, 1977), and two FIBA Korać Cups (1976, 1977).

Tvrdić played with the senior Yugoslav national team at the 1972 Summer Olympic Games.

This biographical article relating to a Croatian basketball figure is a stub.