For the last 14 years of his life, he was in a relationship with costume designer Mimi O'Donnell, whom he had met in 1999 when they were both working on the play In Arabia We'd All Be Kings, which Hoffman directed.
Posljednjih 14 godina svoga života Hoffman se nalazio u vezi s kostimografkinjom Mimi O'Donnell koju je upoznao 1999. godine dok su oboje radili na predstavi Arabia We'd All Be Kings koju je on i režirao.