She was found guilty on charges of inciting dissent and breaking Covid rules under a natural disasters law.
Ms Suu Kyi faces 11 charges in total, all of which she has denied.
She has been under house arrest since February when the military launched a coup, toppling her elected civilian government and detaining leaders.
It is not clear when or if Ms Suu Kyi will be placed in prison.
Co-defendant Win Myint, the former president and Ms Suu Kyi's National League for Democracy (NLD) party ally, was also jailed on Monday for four years under the same charges.
The 76-year-old has been slapped with an array of charges, including multiple counts of corruption and violating the official secrets act.
Little has been seen or heard of her apart from her brief court appearances.