The 2021 CS Golden Spin of Zagreb was held on December 7–11, 2021 in Sisak, Croatia.

[1] It was part of the 2021–22 ISU Challenger Series.

[2] Medals were awarded in the disciplines of men's singles, women's singles, pair skating, and ice dance.

The non-Challenger portion of the event for juniors was cancelled.

[3] The International Skating Union published the list of entries on November 15, 2021.