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We report on the identification of a new possible Isolated Neutron Starcandidate in archival ROSAT observations. The source 1RXS J214303.7+065419,listed in the ROSAT Bright Survey as RBS 1774, is very soft, exhibits a thermalspectrum well fitted by a blackbody at ${T}\sim 90$ eV and has a low columndensity, ${N_H}\sim 5\times 10^{20}$ ${cm}^{-2}$. Catalogue searches revealedno known sources in other energy bands close to the X-ray position of RBS 1774.Follow-up optical observations with NTT showed no peculiar object within theX-ray error circle. The absence of any plausible optical counterpart down to${m_R}\sim 23$ results in an X-ray to optical flux ratio in excess of 1000.Comment: LaTeX (A&A style files), 5 pages, 3 figures. Accepted for publication  in Astronomy and Astrophysics Letters. Minor correction

1RXS J214303.7+065419/RBS 1774: A new Isolated Neutron Star candidate