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We present the results of near-IR lunar occultation measurements of three well-known, large angular diameter, cool giant stars, namely X Cnc (CII), U Ori (M8III) and η Gem (M3III). Their 2.2 µm angular diameters, derived under the assumption of a uniform circular disk, are 8.26 ± 0.04, 15.14 ± 0.05 and 12.57 ± 0.04 milliarcsec, respectively. In the case of U Ori, we find a significant deviation of the brightness profile from circular symmetry, as well as a faint signature of extended emission.doi:10.1051/0004-6361:20021796 fatcat:vwsvrakqnzc7pea3p2ntcbyfji