Muriel Newman (born 6 April 1950) is a former New Zealand politician. She was the deputy leader of ACT New Zealand.
Newman was born in northern England, but arrived in New Zealand at the age of eight. She was raised in Whangarei. She gained a BSc in mathematics from University of Auckland, and then a Ph.D. in mathematics education from Rutgers University in the United States. After working in the education sector for twenty years, she entered the business world with Michael Hill International, eventually becoming the deputy general manager of the New Zealand operation before being elected to Parliament. She has been a president of the Northland Chamber of Commerce, a member of the Northland Health Board, and member of the Northland Conservation Board.
Newman was a founding member of the ACT New Zealand party, and was one of its candidates in its first election. She was elected to Parliament as a list MP. In 2004, when Richard Prebble stepped down as ACT's leader, Newman chose to step forward as a candidate to succeed him. In the end, the leadership was won by Rodney Hide, but Newman nevertheless emerged with the role of deputy leader.
She remained a list MP until the 2005 election, in which only two ACT MPs were returned.