Oscar Plattner (17 February 1922 – 21 August 2002) was a Swiss cyclist.

[1] Every year between and including 1944 and 1946, Plattner won the Swiss National Amateur Sprint Championships.

From 1947 until 1964, Plattner competed in the Swiss National Sprint Championships and won every year he participated.

Plattner won the Tour de Berne in 1950 and the Grand Prix du Paris in 1953.

Plattner also won the national Madison championships in 1958 and 1959 with Walter Bucher.