This thesis was written to provide evidence and justification for the inclusion of historically significant automobiles on the National Register of Historic Places (NRHP). During the first half of the twentieth century, the automobile transformed American culture and reshaped Americas landscape. The NRHP includes thousands of individual listings of road-related resources which owe their significance to the automobile. Automobiles themselves, however, are not represented. Arguing for their inclusion, this thesis begins by examining the early history of automobiles in the United States and the history of the NRHP. Mobile structures listed on the NRHP, such as ships and aircraft, are then evaluated for similarities with automobiles. Finally, a privately-run register for historic automobiles is evaluated for compatibility with the NRHP.