Both supporters of Prime Minister Nikol Pasjinian and opposition groups have called for demonstrations during the day.
Pasjinian has been in the hot air since signing a peace deal over the Nagorno-Karabakh breakaway area with arch-rival Azerbaijan, something some Armenians see as treason.
This weekend, thousands of protesters marched through Yerevan to demand a change of power.
Last week, Pasjinian condemned the army's demand for his resignation, a request he himself described as a coup attempt.