1,3,5,7-Tetramethyl-1,3,5,7-tetrasilaadamantane is the organosilicon compound with the formula (CH2)6(SiCH3)4.

It is a colorless solid that is soluble in organic solvents.

The compound is one of the iconic carbosilanes, featuring alternating −Si−C−Si−C− linkages.

It arises as one of many products from the pyrolysis of tetramethylsilane.

A more efficient route involves the reaction of the cyclic carbosilane (CH2Si(CH3)2)3 (1,1,3,3,5,5-hexamethyl-1,3,5-trisilacyclohexane) with aluminium tribromide.