The Diplomat: Season 4
2026 · 8 episodes · ★ 8.8
What Season 4 of The Diplomat
In Season Four, two marriages threaten to eat each other alive. One catastrophic moment shatters the fragile peace Kate Wyler brokered between the US and UK, 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.
Season 4 Episodes
4x01 Windsor
On an unplanned stopover at Windsor Castle, Kate grows wary of Hal and Grace's dynamic as she tries to contain the fallout from their covert actions.
Directed by: Alex Graves · Written by: Debora Cahn · Starring: Penny Downie, Georgie Henley, Richard Dillane, Graham Miller
4x02 Redcoats
A shocking security breach sends the administration into crisis as Hal assumes new duties. Trowbridge launches a manhunt, and Kate looks to the future.
Directed by: Alex Graves · Written by: Debora Cahn · Starring: Penny Downie, Georgie Henley, Richard Dillane, Graham Miller
4x03 The Typo
A budgetary snag threatens to torpedo negotiations, with costly implications for the US. Stuart and Eidra get personal as they weigh their next move.
Directed by: Liza Johnson · Written by: Jessica Brickman · Starring: Adam Silver, Richard Dillane, Graham Miller, Carol Mazhuvancheril
4x04 Pagliacci
After Hal drops a bombshell that throws the UK alliance into jeopardy, Kate faces mounting pressure to control the damage by any means necessary.
Directed by: Liza Johnson · Written by: Peter Noah · Starring: Celia Imrie, Penny Downie, Richard Dillane, Graham Miller
4x05 Special Envoy
Kate contends with her complicity in a stunning political shake-up, while a disenchanted Todd explores his options across the pond.
Directed by: Tucker Gates · Written by: Eli Attie · Starring: Miguel Sandoval, Penny Downie, Georgie Henley, Jodie Whittaker
4x06 The Dead
When a dangerous adversary makes its move, Grace issues a hard-line threat to the prime minister, forcing Kate to reckon with her role as the messenger.
Directed by: Tucker Gates · Written by: Julianna Dudley Meagher · Starring: Miguel Sandoval, Penny Downie, Adam Silver, Graham Miller
4x07 Phony Negroni
Personal and political lives collide — and damaging secrets surface — when Kate and Hal join Grace and Todd in Italy ahead of the G7 summit.
Directed by: Alex Graves · Written by: Anna Hagen · Starring: Graham Miller, Rosaline Elbay, Carol Mazhuvancheril
4x08 Warships Season Finale
At a meeting of world leaders, a diplomatic breakdown edges the US closer to an international crisis — and compels Kate to make a seismic decision.
Directed by: Alex Graves · Written by: Debora Cahn · Starring: Miguel Sandoval, Graham Miller, Rosaline Elbay, Carol Mazhuvancheril
Season 4 Cast
Ali AhnEidra Park8 episodes
Ato EssandohStuart Hayford8 episodes
Nana MensahBillie Appiah8 episodes
Penny DownieFrances Munning5 episodes
Richard DillaneTom Libby4 episodes
Rosaline ElbayNora Koriem4 episodes
Georgie HenleyPensy3 episodes
Adam SilverHoward2 episodes
Aidan TurnerCallum Ellis2 episodes
Pandora ColinLydia TrowbridgeEpisode 1
Neil PearsonLieutenant General FitzwilliamEpisode 1All Seasons
Season 12023 · 8 ep. · 
Season 22024 · 6 ep. · 
Season 32025 · 8 ep. · Where to Watch Season 4 of The Diplomat
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Frequently Asked Questions
How Many Episodes Are in The Diplomat Season 4?
Season 4 of The Diplomat has 8 episodes.
When did The Diplomat Season 4 premiere?
Aired October 15, 2026.
Where to Watch The Diplomat Season 4
In Spain, on Netflix and Netflix Standard with Ads.