The Pioneer Oil Company Filling Station is a historic building located in Grinnell, Iowa, United States.

The building was expanded in 1931 into a more traditional filling station as selling fuel became a more prominent part of the operation.

The building attained its present appearance in 1937 when the service bays and the decorative brick veneer were added.

It retained its original name, "Pioneer Oil Company," throughout its time as a service station even though it became affiliated with Mobilgas in 1936.

This article about a property in Poweshiek County, Iowa on the National Register of Historic Places is a stub.