Rapola's fort (Finnish: Rapolan linnavuori) is a hill fort in Sääksmäki in the municipality of Valkeakoski, Finland. As is the case with most hill forts in the Baltic area not much is known about its exact origins or purposes. One postulation is that it was built by the inhabitants in their struggles against invading Novgorodians and Swedes. According to excavations, the fort seems to have been in operation at least during the 13th and 15th centuries. Parts of it may be even earlier, since the area has been inhabited already in the 7th century.