Paul Morley
Paul Morley was a human who dated Sarah Jane Smith in 1996. (PROSE: Interference - Book One, Interference - Book Two) One source suggested that she married him by 1998, but this was contradicted in other sources. (PROSE: Christmas on a Rational Planet, TV: The Wedding of Sarah Jane Smith)
Behind the scenes
The 1996 New Adventures novel Christmas on a Rational Planet by Lawrence Miles contains the following epigraph:
As I once told the reigning monarch of, er, of a small nation in the former Soviet Union ... there's nothing 'only' about being a girl.
This is clearly intended to be Sarah Jane Smith, as the line "there's nothing 'only' about being a girl" was spoken by Sarah Jane to Queen Thalira in TV: The Monster of Peladon.
In the 1999 two-part Eighth Doctor Adventures novel Interference, also by Miles, Sarah Jane Smith is dating Paul Morley in 1996 and considering taking her relationship with him further. In Interference - Book Two, she thinks of him as her "future husband" (immediately following the thought with I can't believe I just thought that).
Clearly, Miles intended to imply that Sarah Jane married Paul Morley some time between her encounter with the Eighth Doctor in 1996 and her Nobel address in 1998. However, this was implicitly contradicted when Sarah Jane returned to television in TV: School Reunion. It was explicitly contradicted in TV: The Wedding of Sarah Jane Smith, in which Sarah says that she's never been married.
