Oprah has been with her partner, Stedman Graham, since 1986. The two aren't legally married, but are in a "spiritual union".
Oprah has said on more than one occasion that marriage was never discussed in their relationship. She tells Vogue, "Nobody believes it, but it’s true. The only time I brought it up was when I said to Stedman, ‘What would have happened if we had actually gotten married?’ And the answer is: ‘We wouldn’t be together.’ ... because marriage requires a different way of being in this world."