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The Caryatids, the sculpted women supporting the Erechtheion's south porch on the Acropolis, were likely sculpted by Alcamenes and his workshop, though the exact identity of the architect is uncertain. While the Erechtheion's overall design is attributed to several architects, including Mnesikles, Kallikrates, and Iktinos, the Caryatids themselves are credited to Alcamenes, a sculptor known for his work in Pheidias's workshop.
Here's a more detailed breakdown:
The Erechtheion: This temple, dedicated to both Athena and Poseidon, was designed by a team of architects including Mnesikles, Kallikrates, and Iktinos.
The Caryatids: These six female figures, each uniquely sculpted, serve as supporting columns for the Erechtheion's south porch.
Sculptor Attribution: While the overall temple design is attributed to the architects, the Caryatids are generally attributed to the sculptor Alcamenes and his workshop, according to the Acropolis Museum.
Alcamenes's Connection to Pheidias: Alcamenes was a sculptor known to have worked in the workshop of the renowned sculptor Pheidias, who also worked on other Acropolis projects.
The Caryatids' Significance: These figures are not just decorative; they are functional architectural elements, demonstrating the Greek mastery of blending art and engineering.

https://www.theacropolismuseum.gr/en/conservation-antiquities/karyatids-erechtheion