Family
- father Tony Marshall: Received credit as producer on many of son's projects beginning with "The Odd Couple" (1970-1975); once worked as an usher at the legendary Loews Paradise movie theater in the Bronx with Leonard Goldenstein, who went on to become the head of ABC-TV; died in 1999 at age 93
- mother Marjorie Irene Marshall: Ran a tap dance school called The Cellar in the basement of their Bronx apartment building; when she died in 1983, the family funded a $1 million building to Northwestern University in her honor, called the Marjorie Ward Marshall Dance Studio
- sister Penny Marshall: Born in 1942; got first break on "The Odd Couple" (ABC), produced by Garry; later starred in "Laverne and Shirley" (ABC) from 1976 to 1983, which was also produced by Garry; later directed "Big" (1988) and "A League of Their Own" (1992)
- sister Ronelle Marshall: Began as casting consultant on "Happy Days" (ABC), eventually receiving credit as associate producer and producer on the series; executive produced ABC's "Joanie Loves Chachi" (1982-83); produced ABC's long-running "Step By Step" (1991-1998); acted in brother's "Dear God" (1996)
- daughter Lori Marshall: Born in 1963; co-wrote autobiography with father; played small parts in a number of father's features, beginning with "Young Doctors in Love" (1982)
- daughter Kathleen Marshall: Born in 1967; acted in father's "Pretty Woman" (1990) and "The Princess Diaries" (2001) and "The Princess Diaries 2: Royal Engagement" (2004); supervised construction on Marshall's Falcon Theatre in Burbank
- son Scott Marshall: Born in 1969; studied directing at the American Film Institute; served as second unit director for father's "Dear God" (1996) and Penny's "The Preacher's Wife" (1996); made directorial debut with "Spin Cycle" (2000)
Companions
- wife Barbara Marshall: Married in 1963; made a brief appearance in "Beaches" (1988) as a nurse
- wife Barbara Marshall: made a brief appearance in "Frankie and Johnny" (1991) as a nurse; married c. 1963
