The 16-episode season is to air next year.
"No other series on television travels the globe to tell a story like 'Covert Affairs,' and we are pleased to bring it back for another season," Chris McCumber, president of USA Network, said in a statement. "With its intricate storytelling, diverse characters and authentic locations, the series continues to be a cornerstone in our line-up of USA's original signature dramas."
Season 4 is to wrap up Nov. 21.
The show stars Piper Perabo as Annie Walker, a young CIA operative "whose exceptional linguistic skills and killer instinct make her invaluable to the agency," a synopsis said.