Ján Popluhár (12 September 1935 – 6 March 2011) was a former Slovak football player who played primarily for club ŠK Slovan Bratislava and was also a member of the Czechoslovakia national team, playing in two World Cups (1958 and 1962).

Popluhár started his football career after high school with RH Brno. However, he is best known for the 15 seasons he spent with ŠK Slovan Bratislava where he made 262 competitive appearances in defence, scoring 21 goals, and following further stints with Brno and Zbrojovka Brno finished on 306 Czechoslovakian league games and a goalscoring tally of 24. After finishing his career with Slovan in 1968 he moved to French league side Olympique Lyonnais. Two seasons there were enough, but subsequently he spent five years with Austrian amateur club SK Slovan Vienna as player/coach. Many of the thousands of fans in Vienna thought that Popluhár would be shown up by players twenty years younger than he was, but this did not happen. However, at the age of 44 Popluhár realised that his playing career was over.

Karel Růžička (born May 11, 1909, date of death unknown) was a Czechoslovakian bobsledder who competed in the 1930s. He won a silver medal in the two-man event at the 1935 FIBT World Championships in Igls.

Ruzicka also competed at the 1936 Winter Olympics in Garmisch-Partenkirchen, finishing 20th in the two-man event and did not finish the four-man event.