Tetrakis(trimethylsilyl)methane (TTMSM) is an organic compound with formula C<sub>13</sub>H<sub>36</sub>Si<sub>4</sub>, consisting of four trimethylsilyl (Si(CH<sub>3</sub>)<sub>3</sub>) groups bonded to a central carbon atom. It is extremely sterically crowded but unlike with the all-carbon equivalent tetra-tert-butylmethane which is only known as a theoretical compound, the longer silicon-carbon bonds allow this compound to be synthesised.