Triethoxysilane is an organosilicon compound with the formula HSi(OC2H5)3.

It is a colourless liquid used in precious metal-catalysed hydrosilylation reactions.

The resulting triethoxysilyl groups are often valued for attachment to silica surfaces.

[1] Compared to most compounds with Si-H bonds, triethoxysilane exhibits relatively low reactivity.

[2] Compounds based on triethoxysilane might be used in fluoride varnish.