Ternary compounds (Pr,Nd,Sm)Mn6Sn6have been synthesized by argon arc melting starting from the pure elements. All compounds were found to be isotypic with HoFe6Sn6(space groupImmm‐D2h25, no. 71;Z=6). The HoFe6Sn6type is a stacking variant composed of slabs of the HfFe6Ge6type and of the ScFe6Ga6type. The compounds order ferrimagnetically slightly above room temperature exhibiting a strong magnetocrystalline anisotropy. The119Sn Mo¨ssbauer spectra at 15 and 293 K were fitted with five magnetic sextets, with hyperfine fields ranging from 12 to 32 T at 15 K.