The COMBO-17 Archive is an implementation of catalogues of the COMBO-17 Survey. The COMBO-17 survey has imaged 1 square degree of sky in 17 optical filters using the Wide Field Imager at the MPG/ESO 2.2-m telescope at La Silla, Chile. It found ∼25000 galaxies and ∼300 QSOs with redshift errors of dz/(1+z)∼0.02, as well as ∼5000 stars and ∼30 white dwarfs. It has deep and sharp R-band data for exploration of weak gravitational lensing.