Rebecca Best (born 18 January 1964), married name Rebecca O'Callaghan, is an English-born former professional squash player. She reached a career-high world ranking of 6 in July 1988 and was a seven-time champion of Ireland.
Biography She was born in Sheffield, but represented Ireland. She won four consecutive silver medals with the Ireland women's national squash team at the European Squash Team Championships from 1986 to 1989.
Best won the first of her seven Irish national titles in 1987. After securing her fifth national crown in April 1992 she married and competed under her married name thereafter.
In December 1993, O'Callaghan won her seventh and last national title.
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