We have recently reported the ?1 d 1 square-lattice compound BaTi2Sb2O, which shows superconductivity at ?c=1.2 T c = 1.2 K coexisting with a charge- or spin-density wave (CDW/SDW) state. Here, we successfully prepared two new oxybismuthides, BaTi2Bi2O and (SrF)2Ti2Bi2O, as the first Pn = Bi compounds in the ? A Ti2 Pn 2O family. The CDW/SDW state disappeared for both compounds, presumably owing to the considerable interaction between the Ti-3? 3 d and Bi-6? 6 s orbitals. The complete suppression of the CDW/SDW instability resulted in an enhanced ?c T c of 4.6 K for BaTi2Bi2O. However, (SrF)2Ti2Bi2O exhibits no superconductivity, suggesting the importance of the interlayer interaction for superconductivity.