Fifteen ternary rare-earth metal gallium silicides have been synthesized using molten Ga as a molten flux. They have been structurally characterized by single-crystal and powder X-ray diffraction to form with three different structures—the early to mid-late rare-earth metals RE=La–Nd, Sm, Gd–Ho, Yb and Y form compounds with empirical formulae RE(Ga x Si 1−x ) 2 (0.38≤x≤0.63), which crystallize with the tetragonal α-ThSi 2 structure type (space group I4 1 /amd, No. 141; Pearson symbol tI12). The compounds of the late rare-earth crystallize with the orthorhombic α-GdSi 2 structure type (space group Imma, No. 74; Pearson symbol oI12), with refined empirical formula REGa x Si 2−x−y (RE=Ho, Er, Tm; 0.33≤x≤0.40, 0.10≤y≤0.18). LuGa 0.32(1) Si 1.43(1) crystallizes with the orthorhombic YbMn 0.17 Si 1.83 structure type (space group Cmcm, No. 63; Pearson symbol oC24). Structural trends are reviewed and analyzed; the magnetic susceptibilities of the grown single-crystals are presented.