Bronsted acidity of two samples of H-MCM-22 with different Al content is studied both in terms of the ability to transfer the proton to ammonia, ethene, and propene and in terms of the tendency to engage in H bonding with organic molecules (acetone, benzene, toluene, ethene, propene). Comparison is made with similar results for H-ZSM-5 and H-Mordenite zeolites. Whereas the H-bonding tendency is in the order H-ZSM-5 greater than or equal to H-MCM-22 > H-MOR, protonation of propene at 300 K is slower with H-MCM-22 than with H-ZSM-5 and H-mordenite, and ethene oligomerization does not take place on the H-MCM-22 sample with the lowest Al content. Steric constraints seem to exist at the proton sites of MCM-22, which may explain the lower ability to transfer the proton with respect to H-ZSM-5 and H-mordenite.