The Main Guard Post (Finnish: Päävartio) is a guard post building and a city block in the district of Kruununhaka in Helsinki, Finland, in connection with the Presidential Palace at Mariankatu 1.

[2] The building is most often cited as designed by Carl Ludvig Engel, but sometimes by Eduard von Anert.

[1][5] Both the main guard post and the financial building remain in almost their original use to this day.

The main guard post hosts offices for the Helsinki garrison.

[3] During the Finnish Civil War, the Main Guard Post was one of the last bastions of the Reds in Helsinki.