Fay Surtees Marles AM (née Pearce; 3 January 1926 – 1 November 2024) was an Australian public servant. She served as Victorian Commissioner of Equal Opportunity from 1977 to 1987 and Chancellor of the University of Melbourne from 2001 to 2004.

Marles was born Fay Pearce in Melbourne on 3 January 1926. She was the second of three children born to Jane Victoria (née Crisp) and Percy William Pearce; an older sibling died as an infant. Marles' father was a World War I veteran and Military Cross recipient; after returning from the war he ran the Bjelke-Petersen School of Physical Culture in Melbourne.

Marles attended Ruyton Girls' School in Kew. She graduated from the University of Melbourne in 1948 with a Bachelor of Arts and Diploma of Social Work. She subsequently became a social worker in Queensland. However, after her marriage to Donald Marles in 1952 she was subjected to the marriage bar and forced to resign her position.

Marles completed a Master of Arts in 1975 as a mature-age student and joined the University of Melbourne's faculty as a senior tutor and later lecturer in social work.

In 1977, Marles was appointed Victoria's Commissioner of Equal Opportunity, following the passage of the Equal Opportunities Act 1977 by the government of Dick Hamer. She launched an "extensive community awareness campaign on discrimination", including issues like sexual harassment, paternity leave, workplace discrimination against women, and women in the priesthood. In her autobiography she recalled that she had experienced "several death threats and intimidating behaviour during her time as commissioner". In 1978, Marles attracted attention with her intervention on behalf of female pilot Deborah Lawrie in her sex discrimination case against Ansett Australia. Lawrie's case progressed from the Equal Opportunity Board and was eventually appealed by Ansett to the High Court, which ruled in Lawrie's favour.

Marles resigned as Equal Opportunity Commissioner in 1986 and established a consulting firm, Fay Marles & Associates, specialising in equal opportunity and anti-discrimination. She continued to work closely with her replacement as commissioner, Moira Rayner.

Marles was first elected to the University of Melbourne Council in 1984 and became a deputy chancellor in 1986. She served as chancellor from 2001 to 2004, the first woman to hold the position. As chancellor, she was an advocate for increasing the number of Indigenous Australian graduates, working "closely with Indigenous members of the university to establish the Koori Education Centre employing Koori staff and providing a space for Indigenous students to have time on their own without pressure". She also encouraged participation from international alumni and was an advocate for the increased involvement of women in university processes.

Marles was an unsuccessful candidate at the 1997 Australian Constitutional Convention election, running alongside five candidates (including Eve Mahlab and Kim Rubenstein) under the banner of "The Women's Ticket – An Equal Say". Their group polled 2.4 percent of first-preference votes in Victoria.