Cilly Aussem (Cologne, 4 January 1909 – 22 March 1963 in Portofino, Italy) was a German female tennis player.
She was the first German to win the women's singles title at Wimbledon in 1931. She also won the women's single titles at the French Championships and German Championships in 1931. Aussem's coach and mixed doubles partner was Bill Tilden. They won the mixed doubles title at the 1930 French Championships.
According to Wallis Myers of The Daily Telegraph and the Daily Mail, Aussem was ranked in the world top ten in 1928, 1930, 1931, and 1934, reaching a career high of World No. 2 in those rankings in 1930 and 1931 just behind Helen Wills Moody.
Read more about Cilly Aussem: Early Years, Bill Tilden's Helpful Advice, Break Through in 1930, First German Wimbledon Champion in 1931, A Fateful Trip and Its Consequences, Private Life After Tennis, Grand Slam Singles Tournament Timeline