'West Wing' Star Dule Hill Files for Legal Separation

"West Wing" star Dule Hill has filed for legal separation from his wife ... TMZ has learned.

Hill filed the docs in L.A. County Superior Court against wife Nicole Lyn, citing irreconcilable differences. His wife Nicole's a TV actress known for her role on the Canadian show "Student Bodies."

Nicole also DJs under the name Ms. Nix.

Dule and Nicole were married in July 2004 and separated just days after their anniversary in 2012, eight years later. They have no minor children.