This has been on my mind for a while, and comes back everytime some MRA blathers about how feminism is breaking their science fiction. We’ve always been here, asshole. 

Mary Shelley (19th c.)
Margaret Cavendish (17th c.)
Ursula K. Le Guin
Andre Norton
Joanna Russ
Anne McCaffrey
Octavia Butler
Louisa May Alcott (A.M. Barnard)
Karen Anderson
Margaret Weis
Elizabeth Moon
Anne Bishop
Jacqueline Carey
Marion Zimmer Bradley (numerous pseudonyms)
Patricia Briggs
Moyra Caldecott
C.J. Cherryh
Kathleen O’Neal Gear
Shirley Jackson
Katherine Kurtz
Mercedes Lackey
Tanith Lee
Madeleine L’Engle
Holly Lisle
Morgan Llywelyn
Pat O’Shea
Diana Paxson
Tamora Pierce
Anne Sexton
Judith Stein
Judith Tarr
Terri Windling
Janny Wurts
Jane Yolen
C.S. Friedman

A far more extensive list is here:
and here: