The OA vz. 27 (Obrněný automobil vzor 27) was a Czechoslovak-designed armored car used by Nazi Germany, Slovakia, and Romania during World War II. Fifteen were built, of which the Germans seized nine when they occupied Bohemia-Moravia in March 1939 and the Slovaks captured three when they declared independence from Czechoslovakia at the same time. Romania acquired three when Czech troops sought refuge in Romania after the Hungarian invasion of Carpatho-Ukraine that same month. All were used for training or internal security duties during the war.