Dame Margaret Myfanwy Wood Booth, DBE (born 11 September 1933) is a retired British judge.
In January 1979, she became the third woman to be appointed as a High Court judge. Like her predecessors, Elizabeth Lane and Rose Heilbron, she was assigned to the Family Division.
She retired from judicial office in 1994. She was awarded an honorary LLD by the University of Liverpool in 1992, and served as the Vice-President of its Council from 1996 to 1999.
She became a fellow of University College, London in 1992, and is president of the National Family and Parenting Institute.