碳酸铯（英语：Caesium carbonate）是一种无机化合物，属于碳酸盐，化学式为Cs₂CO₃

制作碳酸铯的方法也适用于碳酸铷。

可由碳酸铵与氢氧化铯反应制得。

Caesium carbonate or cesium carbonate is a white crystalline solid compound. Caesium carbonate has a high solubility in polar solvents such as water, alcohol and DMF. Its solubility is higher in organic solvents compared to other carbonates like potassium and sodium carbonates, although it remains quite insoluble in other organic solvents such as toluene, p-xylene, and chlorobenzene. This compound is used in organic synthesis as a base. It also appears to have applications in energy conversion.