1,1,3,3-Tetramethyl-1,3-divinyldisiloxane (also referred to as tetramethyldivinyldisiloxane) is the organosilicon compound with the formula O(SiMe<sub>2</sub>CH=CH<sub>2</sub>)<sub>2</sub>.
Tetramethyldivinyldisiloxane is a colorless liquid that is employed as a ligand in organometallic chemistry and also as a homogeneous catalyst. The ligand is a component of Karstedt's catalyst. It was first prepared by hydrolysis of vinyldimethylmethoxysilane, (CH<sub>2</sub>=CH)Me<sub>2</sub>SiOMe.