Rudolf Rupec (17 September 1895^[1] or 17 November 1896 – 1 July 1983) was a Croatian footballer. He played for SK Rapid Wien and HŠK Građanski Zagreb. He played for the national teams of Austria and the Kingdom of Serbs, Croats and Slovenes. He also played at the 1920 Summer Olympics and the 1924 Summer Olympics. ^[2]

He began his career at SK Rapid Wien from 1913 to 1920. With Rapid he won the championship four times and once the cup. In 1920 he went to the Croatian team HŠK Građanski Zagreb. He played with the club until the end of his career in 1928. With the club he won the national championship of the Kingdom of Serbs, Croats and Slovenes in 1923 and 1926.

In the last years of the Austro-Hungarian Empire he played ten matches for the Austria national football team. Rupec was part of the Kingdom of Yugoslavia's first national team. He played nine matches for them. He played at the 1920 Summer Olympics and the 1924 Summer Olympics. His final game was in May 1924 in the Olympic Games match against Uruguay.

He later coached HAŠK Zagreb. He won the championship in 1938.

• Austrian football championː 1915–16, 1916–17, 1918–19, 1919–20
• Austrian Cupː 1918–19