[citation needed] The subject of the coat of arms of Orimattila, "a stallion horse carrying a scythe", refers to both the name of the municipality and local agriculture.

[8] The coat of arms was designed by Ahti Hammar and approved by the Orimattila Municipal Council at its meeting on 15 September 1956.

Orih is an older pronunciation of the word ori meaning "stallion", though the loss of the h in place names was prevented by the element after it, in this case -mattila (cf.

[9] During the Great Northern War, which was caused by the Russian occupation of Finland, the parishes of Orimattila and Hollola were temporarily united.

[citation needed] Many immigrants from the Kirvu region were settled in Orimattila as a result of the Continuation War.