Bis(trimethylsilyl)mercury is a chemical reagent with the formula (CH3)3-Si-Hg-Si-(CH3)3.

This compound was first synthesized by Wiberg et al. in 1963, by the reaction of trimethylsilyl bromide with sodium amalgam:[1] On prolonged heating at 100-160 °C, or when stood under light as an ethereal solution, it decomposes to hexamethyldisilane:[1] Reaction with hydrogen chloride gives trimethylsilane and trimethylsilyl chloride:[1]