Abigail McGrath (September 18, 1940 – December 20, 2024) was an American writer, actor, playwright, and theater co-founder. She established the Off Center Theater in Manhattan and later founded the Renaissance House Writers and Artists Retreat on Martha's Vineyard.

Abigail Calachaly Hubbell was born on September 18, 1940, in Manhattan, New York City​.^[1] She was the only child of Helen Johnson Hubbell, a Harlem Renaissance poet known professionally as Helene Johnson, and William Warner Hubbell III, a stevedore who later became a subway conductor​.^[1] Her middle name, Calachaly, was inspired by her mother's imaginary childhood friend​.^[1]

McGrath was raised in Fort Greene, Brooklyn, in what she described as "genteel poverty," characterized by cultural activities such as theater and opera outings​.^[1] She attended Little Red School House graduated from Washington Irving High School​.^[1]

She pursued theater arts at Bard College. While at Bard, she married fellow student Leonard Rosen, with whom she had a son, Jason, before their divorce​.^[1] After graduating, McGrath worked as a mannequin at the Folies Bergère​.^[1]

McGrath initially aspired to be an actor, working various jobs to support herself, including as a copywriter, a coat-check attendant, and an advertising employee​.^[1] In 1967, she appeared in the film Tub Girls, becoming one of the few Black performers in Andy Warhol's projects and earning US$100 (equivalent to $913.77 in 2023) for her role​.^[1]

In the late 1960s, McGrath co-founded the Off Center Theater in Manhattan with Anthony McGrath, whom she later married. The theater focused on experimental and political works as well as free productions for children. Productions included revised classics such as Cinderella and Little Red Riding Hood with unique interpretations. The theater also served as a platform for actors such as John Leguizamo and Christine Baranski​.^[1]

In 2001, McGrath founded the Renaissance House Writers and Artists Retreat in Oak Bluffs, Massachusetts in honor of her mother and cousin Dorothy West, a Harlem Renaissance writer​​.^[1][2] Renaissance House became a space for writers, particularly those addressing social issues and from underrepresented backgrounds, to focus on their craft​.^[2] The retreat also hosted annual readings of Frederick Douglass's speech, "What to the Slave is the Fourth of July?"​.^[2]

McGrath's experiences inspired aspects of her cousin Dorothy West's novel The Wedding, which was adapted into a miniseries by Oprah Winfrey​​.^[2][3]

McGrath lived with Anthony McGrath from the late 1960s but married him formally in 2016​. The couple had a son, Benson, in addition to her son Jason from her first marriage​.^[1] She died on December 20, 2024, in Manhattan at the age of 84 due to liver cancer​.^[1]