The FX drama, based on the work of Elmore Leonard, stars Timothy Olyphant as Raylan Givens, a deputy US Marshal.
The renewal news was broken by TVLine, with cable network FX expected to officially announce the new season order at its annual upfront presentation later today (March 28) in New York.
The fourth season of Justified currently airs on Tuesday nights and will draw to a close next week (April 2).
Series star Walton Goggins (Boyd Crowder) recently told Digital Spy that he wants the show to last for six seasons.
"If we get the opportunity to have six seasons, I really know - and I think [creator] Graham Yost and the writers know too - where I want [my character] to go," he explained.
"I see it as an arc on a number of fronts, and I think when you're approaching television and storytelling in this format, you really need to think about what it is that you want to say."
Justified also airs on 5USA in the UK.
> Justified: 5 reasons you need to watch Timothy Olyphant drama
Watch a promo for the fourth season of Justified below: