Osbornodon iamonensis is an extinct species of bone-crushing Hesperocyoninae, a predecessor of modern dogs that were endemic to North America and which lived from the Orellan age of the Early Oligocene to Early Miocene epoch 23.6—16.3 Ma and existed for approximately 7.3 million years. O. iamonensis was named by E. H. Sellards in 1916 for Lake Iamonia in northern Florida.