The 26th Costume Designers Guild Awards, honoring excellence in film, television, and short form costume design for 2023, were held on February 21, 2024, at NeueHouse Hollywood in Los Angeles. The nominations were announced on January 4, 2024.

Billie Eilish was presented with the inaugural Vanguard Spotlight Award; the new honor celebrates "a trailblazer who sets new standards in their sphere, not only for their outstanding achievements but also for their courage as a visionary that serves as an inspiration to us all, per the guild". Additionally, Annette Bening received the Spotlight Award.

Winners are listed first and in bold.