Who won the Oscar for best actress in a leading role 1970 43rd Academy Awards movie women love?

There is an error in your question. The Oscars for best actress in a leading role for the 43rd Academy Awards in 1971, not 1970. So, the information I can provide corresponds to that year.

Maggie Smith won the Oscar for Best Actress in a Leading Role at the 43rd Academy Awards for her performance in "The Prime of Miss Jean Brodie."