The opposition leader has urged Russians to boycott the vote, saying "Putin is terribly scared."
The anti-corruption advocate is vowing to appeal the election commission's ruling.
Navalny has already called for a nationwide boycott of the vote in March; he's ineligible to stand due to recent convictions.
Human rights groups have urged authorities to end a campaign of "harassment and intimidation" against the opposition.
All Sources: Deutsche Welle Deutsche Welle