Spoilers below.Good news for fans of The Diplomat: Kate Wyler won’t get to rest any time soon! The Netflix series starring Keri Russell as the titular diplomat is confirmed to return for a fourth season, and after a dramatic season 3 finale, you can trust the next chapter will be a busy (and juicy) one for Kate.In an interview with Netflix’s Tudum, showrunner and executive producer Debora Cahn said, “I’m so excited about season 4. It’s going to be a lot of fun. We get to the end of a season and I always think, ‘Well, there’s no way that we can do this again.’ And then we dig back into it, and it’s like, ‘Oh my God, we have to keep going.’”Here’s what we know so far about season 4.When will The Diplomat season 4 come out?The Diplomat season 4 will premiere on October 15 on Netflix with eight one-hour-long episodes.In an interview with ELLE published in October 2025, Janney teased that production on season 4 was imminent. “We’re about to start season 4, and I don’t know what’s happening, but I have a feeling things are going to get really crazy,” she said.Who is in the cast?Russell, Rufus Sewell, David Gyasi, Ali Ahn, Rory Kinnear, and Ato Essandoh are set to reprise their roles in season 4. Allison Janney and Bradley Whitford have also been promoted to series regulars.“Working with Allison and Brad, watching them together again, and the off-the-charts foursome that is them with Keri and Rufus… it’s an insane bag of candy,” Cahn told Tudum. “Our expectations were high and it blew right past them.”“I was thrilled when I heard that Debora was interested in me doing something,” Whitford previously told Tudum. “I had no idea what it was, but I love the show. I was jealous of the writing on this show. I love Keri. I love Rufus. And I hear Allison Janney is good at acting too. It’s an amazing cast.”“Brad was the fantasy version of Todd—for all of us,” Cahn said. “We still can’t believe it came true.” Executive producer Janice Williams added, “Bradley was the perfect addition to what is already a dream cast.”What is The Diplomat season 4 about?Here’s the official logline from Netflix:“In season 4 of The Diplomat, two marriages threaten to eat each other alive. One catastrophic moment shatters the fragile peace Kate Wyler brokered between the U.S. and U.K., as well as the crumbling marriage she’s trying to save. While she fights to stem the bleeding, President Grace Penn and VP Hal Wyler’s conspiracy to steal Russia’s most powerful weapon hurtles the United States toward war. Kate and Todd, at best an uneasy pair, unite to stop the Grace-Hal alliance from upending the balance of power abroad and at home.”Can I see a trailer?Netflix dropped the first teaser on August 17. It shows Kate trying to save her marriage with Hal, despite all the drama, vowing to him: “I, Katherine Wyler, take you for better or for worse, worse, and worse.”View full post on YouTubeFlip through the gallery below for a closer look at season 4.This story will be updated.