We give a brief summary of present bounds on the size of possible extra-dimensions from collider experiments. Based on talks given by I.A. at Pascos99 [1] Lake Tahoe, California, 10-16 December 1999 and by K.B. at Rencontres de Moriond [2] on Electroweak Interactions and Unified Theories, Les Arcs, France, March 11-18, 2000. Unité mixte du CNRS et de l’EP, UMR 7644.