锗酸铋（Bismuth Germanate 或 Bismuth Germanium Oxide，简称BGO）是Bi₂O₃-GeO₂系化合物的总称，最常见的两种锗酸铋化合物的化学式为Bi₄Ge₃O₁₂（CAS：12233-56-6）和Bi₁₂GeO₂₀（CAS：12233-73-7）。由于应用最为广泛、研究最为深入，“锗酸铋”或“BGO”通常被用来特指Bi₄Ge₃O₁₂（本词条亦遵从此习惯），这是一种立方晶系的无色透明晶体，在高能粒子或高能射线（γ射线、X射线）的作用下能发出峰值波长为480 nm的绿色荧光，利用其闪烁性能可探测高能粒子和高能射线。

Bismuth germanium oxide or bismuth germanate is an inorganic chemical compound of bismuth, germanium and oxygen. Most commonly the term refers to the compound with chemical formula Bi₄Ge₃O₁₂ (BGO), with the cubic evlitine crystal structure, used as a scintillator. (The term may also refer to a different compound with formula Bi₁₂GeO₂₀, an electro-optical material with sillenite structure, and Bi₂Ge₃O₉.)