Christiane Mercelis (born 5 October 1931) is a Belgian former tennis player active in the 1950s and 1960s.
In 1949, Mercelis won the Girls' Singles of the Wimbledon Championships. She competed every year at Wimbledon between 1951 and 1968, and at the French Open between 1952 and 1965. In the French Open, she reached the quarter-finals in 1957.
Mercelis played for Belgium in the Federation Cup from 1963 to 1964 and from 1966 to 1969, losing all five singles matches, and winning two of her eight doubles matches. She is the oldest player to have played for Belgium at 37 years 231 days in her last doubles match against South Africa on 24 May 1969, which she won partnering Michele Kahn.
In the Belgian Tennis Championships. she won 13 singles titles, 14 women's doubles titles, and 16 mixed doubles titles, of which 13 were partnering Jacky Brichant.
Mercelis won 17 singles and 17 doubles titles in official tournaments.
- 1956: Nice
- 1957: Cannes, Nice, Aix-en-Provence
- 1959: Cologne, Moscow, Brussels
- 1960: Brussels, Kent
- 1961: Cannes, Brussels, Knokke, Hilversum)
- 1963: Le Touquet
- 1964: Brussels, Knokke
- 1965: Brussels
- www.itftennis.com https://www.itftennis.com/en/players/christiane-mercelis/800172892/bel/wt/s/overview/. Retrieved 31 May 2021. Missing or empty
- Christiane Mercelis at the Women's Tennis Association
- Christiane Mercelis at the International Tennis Federation
- Christiane Mercelis at the Billie Jean King Cup