Adil Ray's studio-based series comedy centres on larger-than-life community leader Mr Khan, who lives in Birmingham's Sparkhill area with his long-suffering family.
The show has performed solidly in the ratings, launching with 3.7 million and maintaining a series average of 3m.
Creator and star Ray said: "I am thrilled. This is testament to the hard work of the cast, my co-writers and the entire crew. I have been touched to hear from families nationwide who have already taken this cuddly, bearded Pakistani Muslim from Birmingham into their hearts and living rooms. Above all, I thank community leaders who continue to spring up everywhere who provide the inspiration."
BBC One controller Danny Cohen described the series as a "laugh-out-loud family comedy for all generations".
"Citizen Khan has delivered this whilst bringing new comic talent and a fresh flavour to the channel. I can't wait for the second series," said Cohen.
Mark Freeland, head of BBC Comedy, added: "With sitcom, to grab attention all you can ask is laugh-out-loud funny distinctiveness, authenticity and great characters. I think we've certainly grabbed people's attention."
Watch a clip from the show below: