Tricyclodecane (TCD) is an organic compound with the formula C10H16.

[2] Its primary use in the exo form is as a component of jet fuel.

The exo isomer also has a low freezing point.

Its reactions with other materials have been studied,[11][12] as have various production methods.

[13][14] The two isomers can interconvert in the presence of aluminum chloride as catalyst absorbed on substrates such as silicon dioxide or zeolites,[15][16][17][18] with preference for forming the exo as the major product.