Sunnyodon is a genus of tiny, extinct mammal, probably of the Lower Cretaceous.

Found in what is now southern England and Denmark, it was a relatively early member of the extinct order of Multituberculata.

The genus Sunnyodon (meaning "Sunny tooth", after Sunnydown Farm) was named by Zofia Kielan-Jaworowska and Ensom P.C.

Fossil remains of the species Sunnyodon notleyi Lower Cretaceous-age strata of the Lulworth Formation in Durlston Bay, Dorset, England and the Rabekke Formation in Denmark.

[1] A tooth has also been assigned to Sunnyodon from the Berriasian aged Angeac-Charente bonebed in France.