We present the image and catalogue of the 14.3 μ shallow survey of 0.55 square degrees in the region of the Lockman Hole (10^h52^m03^s +57°21'46'', J2000) with the Infrared Space Observatory (ISO). The data have been analyzed with the recent algorithm by Lari et al. (cite{Lari01}, MNRAS, 325, 1173) conceived to exploit ISO data in an optimal way, especially in the case of shallow surveys with low redundancy. Photometry has been accurately evaluated through extensive simulations and also the absolute calibration has been checked using a set of 21 stars detected at 14.3 μm, optical, and near-IR bands. On the basis of simulations, we evaluate that the survey is 80%, 50%, and 20% complete at 0.8, 0.6, and 0.45 mJy, respectively. Below the 20% completeness limit, fluxes are generally overestimated since the sources are preferentially detected if their positions correspond to positive oscillations of the noise. Moreover, from a comparison with the deep survey, we estimate that only sources brighter than 0.45 mJy are highly reliable. Only 5% of these sources do not have optical counterparts down to r' = 25. Since none of the Spitzer imaging bands cover the 14.3 μm wavelength range, this data set will remain unique until the advent of the James Webb Space Telescope. Based on observations with ISO and Isaac Newton Telescope (INT). ISO is an European Space Agency (ESA) project with instruments funded by ESA Member States (especially the P.I. countries: France, Germany, The Netherlands and UK) with the participation of the Institute of Space and Astronautical Science (ISAS) and the National Aeronautics and Space Administration (NASA). INT is operated on the island of La Palma by the Isaac Newton Group in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. Table ef{tab:obsparam}, Figs. ef{fig:coverage} and ef{fig:LH_map} are only available in electronic form at http://www.edpsciences.org Tables 3 and 4 and FITS images are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/427/23