The Melba Goff Matthews photograph collection contains scans taken from Melba Goff Matthews' scrapbook. The images in the Matthews collection reflect her time spent dancing and involvement in other activities at the University of Utah. There are also images of her brother Louis E. Goff and photos from her early career at Murray High School.

The Thorn Mayes photograph collection contains aerial views, 1934-1937, of the San Juan River drainage area, the Rio Grande watershed, and of the Navajo and Zuni Indian Reservations in New Mexico, Arizona, and Utah. This collection also includes an album of hand colored photographs of the Grand Canyon by Fred Harvey of the El Tovar Studio. As well as, slides of various areas in the southwest United States taken between 1962 and 1980.

Scott D. McCoy (1970-) was a lawyer and activist for LGBTQ rights who served in the Utah State Senate from 2005 to 2009. He was the first openly gay person to serve in the Utah State Senate. This collection contains photographs related to McCoy's political career, promotional photographs, and photographs and copy prints collected by McCoy.

The Zella Skidmore McEntire photograph collection consists of family photos, photos of The Broadway Department Store, photos from the unveiling of a bust, and photos of entertainers.

Irving “Bill” McNulty (1918-2000) was a professor of botany at the University of Utah who was involved in the establishment of Red Butte Gardens and the State Arboretum in Salt Lake City, Utah. This collection consists of 3 photographs of an unidentified man, presumably McNulty.

Leonidas Ralph Mecham (1928-2019) served as served as the Director of the Administrative Office of the United States Courts from 1985 until his retirement in 2006. The Leonidas Ralph Mecham photograph collection contains photographs sent to Mecham by friends and colleagues in correspondence and photographs related to Mecham's career.

Doris S. Melich (1913-2007) was a leader in Utah's Girl Scouts of America who, in her later years, served on the boards of many arthritis organizations. The Doris S. Melich photograph collection contains images of Melich's life, family, friends, and participation in Girl Scouts activities dating from 1950 to 1999.

Mitchell Melich (1912-1999) was a Utah lawyer, mining executive, and politican who ran for governor in 1964 and worked as Soliciter for the Department of Interior from 1969 until 1972 under Richard M. Nixon. The Mitchell Melich photograph collection contains photographs depicting Melich's career.

Pat Miller (1948-2013) served as head coach of the University of Utah Ski Team, as president of the Rocky Mountain Intercollegiate Ski Association and as a member of the National Collegiate Athletics Association Skiing Rules Committee. This collection consists of digital-only photographs of Miller's personal life as well as photographs depicting the University of Utah Ski Team and ski-related events and activities.

Stormy Mitsui (1922-2010) owned and operated the City Cafe in Salt Lake City, Utah with his wife Chiyoko Yokoyama Mitsui. This collection contains photographs, slides and negatives of Stormy Mitsui’s family portraits, events and gatherings, City Café, Stormy's remote control model airplane hobby, vacations to Japan and California, and hunting and fishing.

S. Floyd Mori (1939-) is a Japanese American politician and businessman. The S. Floyd Mori photograph collection contains material related to Mori's life and his inovlvement in the Japanese American Citizens' League.

Dorothy Mortensen (1916-2014) was Managing Editor of Publication for the Utah State Historical Society. From 1970 to 1976, she worked in the correspondence section of the White House Staff, during which time she served as writer and editor for the President's Advisory Council on Historic Preservation. The Dorothy Mortensen photograph collection contains 89 slides and prints depicting Mortensen's family, acquaintances, and career dating from 1970 to 2009.

The Tomoko Ogi Moses photograph collection consists of events and exhibits depicting Tomoko Moses' participation in events and exhibits related to Japanese American history.

The Mary Muir photograph collection contains copy prints, negatives, and slides related to Muir's writing and research into artist LeConte Stewart.

The William Mulder photograph collection consists of his personal materials related to family and clubs to which he belonged.

Ina Mae Murri was a community organizer and activist for LGBTQ+ rights. This collection contains 8 photographs of Murri's family, friends, and pets.

The Ted and Yeiko Nagata photograph collection primarily contains materials related to the family and Japanese internment at Topaz, Utah.

The National Organization for Women photograph collection contains images of a march and rally organized by the Utah Chapter in Salt Lake City on October 2, 1982.

The Lyle Nelson photograph collection consists of images and clippings documenting Lyle Nelson's career as a biathlete. Nelson is a four time Olympic biathlete from McCall, Idaho.

L. Jackson Newell (1938-) is an educator, writer, and historian who served as dean of education at the University of Utah before serving as president of Deep Springs College in California from 1995 to 2004. This collection contains photographs and postcards mostly related to the history of Deep Springs College and Newell's time as its president in the 1990s.