Sarah Morewood (1823–1863) was a poet and literary figure who developed a close relationship in the 1850s with her nearest neighbor in the Berkshires, the novelist Herman Melville.
In 1983 Professor Michael Rogin of the University of California, Berkeley, was the first to suggest that Morewood was a model for the character of Isabel in Melville's dark novel of romance and ambition Pierre; or, The Ambiguities (1852).
Thirty-three years later biographer Michael Shelden argued in Melville in Love (2016) that Morewood influenced Melville's work not only in Pierre, but also in Moby-Dick (1851), and that for much of the 1850s the two were lovers.