From whileaway a list of feminist SF compiled by cynthia ward.
bold = read, italic = think I've read but can't remember it very well, underlined = most essential to any reader, feminist or not
Isabel Allende, The House of the Spirits.
Eleanor Arnason, A Woman of the Iron People.
Margaret Atwood, The Handmaid's Tale.
Marion Zimmer Bradley, The Shattered Chain et seq. (collected in The Saga of the Renunciates).
Gerd Brantenberg, Egalia's Daughters: A Satire of the Sexes (a.k.a. Daughters of Egalia).
Dorothy Bryant, The Kin of Ata are Waiting for You.
Katherine Burdekin, Swastika Night.
Octavia E. Butler, Parable of the Sower et seq.
Anne Cameron, Daughters of Copper Woman.
Angela Carter, Burning Your Boats: The Collected Short Stories.
Suzy McKee Charnas, Walk to the End of the World et seq. (Suzy Charnas is suzych)
Sybil Claiborne, In the Garden of Dead Cars.
Samuel R. Delany, Trouble on Triton (previous title, Triton).
Candas Jane Dorsey, Black Wine.
Julie Doucet, My Most Secret Desire: A Collection of Dream Stories.
L. Timmel Duchamp, Love's Body, Dancing in Time (forthcoming, early 2004)
Suzette Haden Elgin, Native Tongue et seq. (Suzette Elgin is ozarque)
Carol Emshwiller, Carmen Dog.
Katherine V. Forrest, Daughters of a Coral Dawn et seq.
Esther Friesner, "A Birthday."
Sally Miller Gearhart, The Wanderground: Stories of the Hill Women.
Mary Gentle, The Book of Ash (published in the U.S. as 4 books, A Secret History et seq).
Karen Joy Fowler, Sarah Canary.
Carolyn Ives Gilman, Halfway Human.
Charlotte Perkins Gilman, Herland and Selected Stories.
Jewelle Gomez, The Gilda Stories.
Hiromi Goto, The Kappa Child.
Nicola Griffith, Ammonite.
Nalo Hopkinson, Brown Girl in the Ring.
Gwyneth Jones, Divine Endurance.
Phyllis Ann Karr, Frostflower and Thorn et seq.
Mary E. Bradley Lane, Mizora.
Ursula K. Le Guin, The Left Hand of Darkness.
Elizabeth A. Lynn, Watchtower et seq.
Maureen McHugh, Mission Child. (I've read other books by her though)
Vonda N. McIntyre, Dreamsnake.
Judith Merril, Daughters of Earth and Other Stories.
Naomi Mitchison, Memoirs of a Spacewoman.
C.L. Moore, Jirel of Joiry.
Pat Murphy, The Falling Woman.
Gloria Naylor, Mama Day.
Rebecca Ore, Gaia's Toys.
Tamora Pierce, Alanna: The First Adventure et seq.
Marge Piercy, Woman on the Edge of Time.
Joanna Russ, The Female Man.
Geoff Ryman, The Child Garden.
Jessica Amanda Salmonson, Tomoe Gozen et seq.
Pamela Sargent, The Shore of Women.
Joan Slonczewski, A Door Into Ocean.
Mary Staton, From the Legend of Biel.
Theodore Sturgeon, Venus Plus X.
Sheri S. Tepper, The Gate to Women's Country.
James Tiptree, Jr., Her Smoke Rose Up Forever.
Elisabeth Vonarburg, In the Mothers' Land.
Sylvia Townsend Warner, Lolly Willowes.
Kate Wilhelm, "Baby You Were Great."
Connie Willis, "Even the Queen...."
Virginia Woolf, Orlando.
Philip Wylie, The Disappearance.
Jane Yolen, Sister Light, Sister Dark.
Pamela Zoline, The Heat Death of the Universe and Other Stories.
I've definitely read 16 of them. Not many.