This articleThis article lists quite a few sword-and-sorcery books that the author viewed as feminist1:
- The Birthgrave by Tanith Lee (1975) along with two sequels
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This world has an early medieval culture with “decadent imperial civilizations,” small city states, nomadic groups, constant little wars and skirmishes and conquests, swords and primitive cannons, multiple religions worshipping various deities, and powerful but mysterious magic.
Wikipedia
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...the majority of the book is about women, their interactions with both men AND women, and their impact on Vazkor’s social status.
from the linked article Note that these are also science fiction, so they might not count as "sword-and-sorcery" according to some definitions.
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...this critiques gender, biology, and destiny while at the same time refusing to offer any easy answers.
Wikipedia
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The story explores many elements from ecofeminism, which has been a hallmark of much of Tepper's writing, both in her feminist science fiction and in her pseudonymous mysteries.2
from the linked article
Additionally, there are the Sword and Sorceress anthologies (currently 30 volumes, published yearly from 1984-present):
...Marion Zimmer Bradley...created the anthology to redress the lack of strong female protagonists in the subgenre of sword and sorcery.
Additionally, there are definitely others; these are just a few examples so that I have evidence there are feminist sword-and-sorcery works but this doesn’t become a list.
TL;DR there are definitely sword-and-sorcery works that are feminist or described as feminist.
1I've not read any of these, so they may not all be obviously within the sword-and-sorcery genre.
2 Wikipedia says "citation needed", so take that with a grain of salt. However, the author's page says she wrote "eco-feminist...science fiction literature" with a source, so this should be a particularly small grain, probably.