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We present U, B, V, I broad-band, 6200A TiO medium-band and Halpha photometryof the Orion Nebula Cluster obtained with the WFI imager at the ESO/MPI 2.2telescope. The nearly-simultaneous observations cover the entire ONC in a fieldof about 34x34 arcmin. They enable us to determine stellar colors avoiding theadditional scatter in the photometry induced by stellar variability typical ofpre-main sequence stars. We identify 2,612 point-like sources in I band, 58%,43% and 17% of them detected also in V, B and U, respectively. 1040 sources areidentified in Halpha band. In this paper we present the observations, thecalibration techniques, and the resulting catalog. We show the derived CMD ofthe population and discuss the completeness of our photometry. We define aspectro-photometric TiO index from the fluxes in V, I, and TiO-band. We find acorrelation between the index and the spectral type valid for M-type stars,that is accurate to better than 1 spectral sub-class for M3-M6 types and betterthan 2 spectral subclasses for M0-M2 types. This allows us to newly classify217 stars. We subtract from our Halpha photometry the photospheric continuum atits wavelength, deriving calibrated line excess for the full sample. Thisrepresents the largest Halpha star catalog obtained to date on the ONC. Thisdata set enables a full re-analysis of the properties of the Pre-Main Sequencepopulation in the Orion Nebula Cluster to be presented, in an accompanyingpaper.

A Multi-Color Optical Survey of the Orion Nebula Cluster. Part I: the Catalog