We present the first set of XMM-Newton EPIC observations in the 2deg^2^ COSMOS field. The strength of the COSMOS project is the unprecedented combination of a large solid angle and sensitivity over the whole multi-wavelength spectrum. The XMM-Newton observations are very efficient in localizing and identifying active galactic nuclei (AGNs) and clusters, as well as groups of galaxies. One of the primary goals of the XMM-Newton Cosmos survey is to study the coevolution of active galactic nuclei as a function of their environment in the cosmic web. Here we present the log of observations, images, and a summary of first research highlights for the first pass of 25 XMM-Newton pointings across the field. In the existing data set we have detected 1416 new X-ray sources in the 0.52, 24.5, and 4.5-10keV bands to an equivalent 0.5-2keV flux limit of 7x10^-16^erg/cm^2^/s. The number of sources is expected to grow to almost 2000 in the final coverage of the survey. From an X-ray color-color analysis we identify a population of heavily obscured, partially leaky or reflecting absorbers, most of which are likely to be nearby, Compton-thick AGNs.

Cone search capability for table J/ApJS/172/29/23fields (*List of the 1389 unique sources detected with a DETML>6 in at least one band)

Cone search capability for table J/ApJS/172/29/table1 (XMM-Newton Observing Log for the COSMOS Field)