Simple modules of Ariki-Koike algebras Andrew Mathas Keywords Ariki-Koike algebras, Iwahori-Hecke algebras, canonical bases. Status Proc. Pure Symp. Math. (to appear). Abstract In this note we classify the simple modules of the Ariki-Koike algebras when q=1 and also describe the classification for those algebras considered in [3,14], together with the underlying computation of the canonical bases of affine quantum group U. In particular, this completes the classification of the simple modules of the Iwahori-Hecke algebras of type B.