The 1921 UCI Track Cycling World Championships were the World Championship for track cycling. They took place in Copenhagen, Denmark from 30 July to 8 August 1921. Three events for men were contested, two for professionals and one for amateurs.
|Date(s)||30 July - 8 August 1921|
|Men's Professional Events|
|Men's Amateur Events|
|Totals (6 nations)||3||3||3||9|