Several people have been killed in recent weeks.
There are 16 presidential candidates - but the main contenders are the incumbent - President Edgar Lungu and opposition leader Hakainde Hichilema – a businessman who has already made several unsuccessful presidential runs.
Five years ago Lungu narrowly defeated Hichilema.
The opposition alleged vote rigging and there was unrest.
Many here worry that history will repeat itself.
Al Jazeera's Haru Mutasa spoke to some of the victims' families, in Lusaka, Zambia.
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