Muriel Grace Patterson OAM (née Quartermaine; born 20 September 1931) is a former Australian politician who served as a Liberal Party member of the Legislative Council of Western Australia from 1989 to 2001, representing South West Region.
Patterson was born in Katanning, Western Australia, to Grace Gertrude (née Harris) and Charles Lewis Quartermaine.
She opened a craft-supply store in Albany in 1976, and eventually became the first female president of the local chamber of commerce.
Patterson was made deputy chairman of committees soon after entering parliament, and in May 1992 was also included in the shadow cabinet of Richard Court.
However, she was not promoted to the ministry when the Liberal Party won the 1993 state election, instead being made government whip.