Sidati was a signatory to a crucial 2015 peace accord.
He was in his 60s and gunned down by two unknown assailants near a mosque.
The reason for the killing was not immediately clear.
Mali s interim prime minister Moctar Ouane said there were two assailants.
Ould Sidati was the rotating president of the Coordination of Azawad Movements (CMA), a mostly ethnic Tuareg alliance that rose up against the central government in 2012. We have just lost our president . who was assassinated this morning in Bamako, CMA spokesman Almou Ag Mohamed said on social media.
Ouane and the UN s envoy in Mali both expressed shock at the killing and paid tribute to Ould Sidati s role in the peace process.
Slain Mali rebel leader Ould Sidati burried
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