Margaret Catherine "Rena" MacDonald (April 3, 1907 – November 16, 1958) was an American athlete.
MacDonald first competed at the AAU women's national outdoor track and field championships in 1926, finishing second in the 8lb shot put to Lillian Copeland.
[5] The 1932 women's national track and field championships held on 16 July in Evanston, Illinois, were the trials for the 1932 Summer Olympics in Los Angeles.
[6] MacDonald set a world record in winning the shot put at the 1934 USA Indoor Track and Field Championships.
[7] Later in life, MacDonald moved to Pittsfield, Massachusetts, where she was a swimming teacher at the Girls Club.