The Diplomat Season 4: Allison Janney & Whitford Join Full-Time: Netflix’s acclaimed political drama The Diplomat is leveling up once again. Just as Season 3 is set to debut on October 16, 2025, the streamer has officially confirmed that Season 4 is moving forward — with two powerhouse stars, Allison Janney and Bradley Whitford, now promoted to series regulars.
Allison Janney & Bradley Whitford Reunite Full-Time in Season 4
The news, first revealed by Variety and confirmed via Netflix Tudum, marks a major reunion for Janney and Whitford — beloved for their chemistry on The West Wing.
Janney first joined The Diplomat in Season 2 as Vice President Grace Penn, returning in Season 3 as the newly appointed President. Whitford joins in Season 3 as First Gentleman Todd Penn, continuing their on-screen partnership.
“Working with Allison and Brad, and watching them together again, with Keri and Rufus — it’s an insane bag of candy,” said series creator Debora Cahn.
Executive producer Janice Williams added, “Bradley was the perfect addition to what is already a dream cast.”
Their expanded roles ensure the Penns will play a central part in the next chapter of The Diplomat’s high-stakes world of power, politics, and personal intrigue.
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Season 4 Production Timeline and Setting
Netflix confirmed that The Diplomat Season 4 will begin production in Fall 2026, filming largely in London and surrounding UK locations.
Following the series’ yearly cycle, Season 4 is expected to premiere globally on Netflix in mid-to-late 2027, available for streaming in the US, UK, and Canada simultaneously.
The Diplomat Season 4 Casting, Audition & Application Process
While The Diplomat remains a scripted, closed-casting Netflix production, aspiring actors and professionals can join future projects or background roles via verified casting networks.
🔹 For UK Applicants
Since filming occurs across England, apply through:
Look out for listings under “Netflix Political Drama – 2026/27” or “The Diplomat Background Casting.”
🔹 For US & Canada Applicants
Actors and crew members in North America can register on:
Upload your acting headshots, showreel, and CV to stay eligible for upcoming Netflix projects filmed in partnership with US and UK teams.
🔹 Crew Opportunities
Production and crew jobs are frequently listed on:
Season 3 Recap: Setting the Stage for Season 4
Before diving into the future, Season 3 (streaming October 16, 2025) promises explosive twists.
Ambassador Kate Wyler (Keri Russell) has accused Vice President Grace Penn (Allison Janney) of orchestrating a terrorist plot — only for the U.S. President to die suddenly, thrusting Grace into power.
Meanwhile, Hal Wyler (Rufus Sewell) finds himself at the center of suspicion, as alliances blur and global stakes intensify.
This intense setup ensures that Season 4 will begin with power struggles, moral dilemmas, and a political chessboard flipped upside down.
The Diplomat Season 4 Returning & Promoted Cast (Confirmed)
| Cast Member | Role | Status in Season 4 |
|---|---|---|
| Keri Russell | Kate Wyler | Returning |
| Rufus Sewell | Hal Wyler | Returning |
| Allison Janney | President Grace Penn | Promoted to Series Regular |
| Bradley Whitford | First Gentleman Todd Penn | Promoted to Series Regular |
| David Gyasi | Austin Dennison | Returning |
| Ali Ahn, Ato Essandoh, Rory Kinnear | Supporting Cast | Returning |
Where to Watch
- Stream The Diplomat Seasons 1 & 2 now on Netflix
- Season 3 premieres October 16, 2025
- Season 4 arrives mid-2027, exclusively on Netflix in the US, UK, and Canada
Follow Official Updates
Stay updated on new casting calls, behind-the-scenes clips, and exclusive interviews through official social media:
- Instagram: @netflix | @netflixuk | @netflixca
- X (Twitter): @Netflix | @NetflixUK
- TikTok: @Netflix
- Official Series Page: www.netflix.com/thediplomat
FAQs — The Diplomat Season 4 (2027)
1. When will The Diplomat Season 4 be released?
A. Season 4 is expected to premiere globally on Netflix in mid-to-late 2027, following its filming schedule in Fall 2026.
2. Who are the new series regulars in Season 4?
A. Allison Janney (President Grace Penn) and Bradley Whitford (First Gentleman Todd Penn) have been promoted to series regulars.
3. How can I audition or apply for The Diplomat Season 4?
A. Actors can apply through trusted platforms like Backstage, Casting Networks, Mad Dog 2020, and Universal Extras for background and supporting roles.
4. Where is The Diplomat filmed?
A. Most of the show’s production takes place in London and other UK locations, with select scenes filmed in the US and Europe.
5. Where can I watch the series?
A. You can stream all previous seasons of The Diplomat exclusively on Netflix US, UK, and Canada.
