By using a needle-like raw material γ-MnOOH as a Mn-source, single crystals of lithium manganese oxides were synthesized in a variety of lithium-containing fluxes including LiNO ₃ , Li ₂ CO ₃ , LiOH, LiCl and Li ₂ SO ₄ . Needle-like Li _1.33 Mn _1.67 O ₄ and Li ₂ MnO ₃ crystals and plate-like polyhedral Li ₂ MnO ₃ crystals were obtained in an LiNO ₃ flux heated within different temperature ranges (300–400, 500–750 and 900–1000 °C, respectively). Not only polyhedral and film Li ₂ MnO ₃ but also octahedral LiMn ₂ O ₄ single crystals were obtained in an LiCl flux by use of different shaped containers to control the exposure to the atmosphere. Orthorhombic LiMnO ₂ crystals with tube- and rod-like shapes could be obtained at the bottom of the LiCl melt at 1000 °C. The lithiation reaction (at low temperature) and dissolution–precipitation controlled growth (at high temperature) of Li ₂ MnO ₃ were also observed in Li ₂ CO ₃ and LiOH fluxes. According to the reaction mechanism, the Li-containing fluxes investigated can be classified into four types: (1) LiNO ₃ , oxidizing flux; (2) LiCl, non-oxide flux; (3) LiOH and Li ₂ CO ₃ , oxidic, but non-oxidizing fluxes; and (4) Li ₂ SO ₄ , no reaction.