Authorities say the robberies happened between 9:30 p.m. Saturday and 4 a.m. Sunday morning.
Three of the robberies happened at 7-Eleven locations in Long Beach, an additional two in Lakewood and one in Bellflower.
In several of those incidents, cash registers were stolen. No injuries were reported.
Officials say the robberies in Lakewood and Bellflower may be related, as well as two of the incidents in Long Beach.
Suspects arrested in possible link to string of OC, LA convenience-store robberies
However, it's unclear if any of the six overnight robberies are tied to the string of other convenience store robberies that happened last week across L.A. and Orange counties.
Several suspects were arrested in those incidents, but others got away.