James Marsters -- best known for his role in "Buffy the Vampire Slayer" -- is about to be single again ... his wife has filed for divorce.
According to court records ... the actor's wife, Patricia Jasmin Rahman, filed divorce docs Wednesday in L.A. County Court. Their split comes 10 years after the couple tied the knot in a private ceremony in L.A.
Patricia and James had what used to be called a May-September relationship -- he's 23 years older than her -- but that's not all that uncommon in Hollywood these days. They didn't have any children together.
James -- who played the British vampire Spike and who also appeared in the 'Buffy' spin-off "Angel" -- has been down this road before. He'd previously married Liane Davidson back in 1989. They got divorced in 1997, and have one son.