The Diplomat Season 4 Hits Netflix with 100% Critic Score
All eight episodes of The Diplomat Season 4 arrived on Netflix on October 16, 2026, with a perfect Rotten Tomatoes critic score.
All eight episodes of The Diplomat Season 4 were released on Netflix on October 16, 2026, according to movieweb.com. The season currently holds a perfect 100% Rotten Tomatoes critic score at the time of reporting.
In the new season, a military crisis erupts, and Kate Wyler, played by Keri Russell, must retrieve a Russian nuclear superweapon called 'Poseidon' from a sunken submarine.
Rufus Sewell returns as Hal Wyler, and Allison Janney plays President Grace Penn. Debora Cahn is the creator and showrunner.
Netflix released all eight episodes at once.
Quick answers
When did The Diplomat Season 4 come out on Netflix?
Season 4 was released on Netflix on October 16, 2026.
How many episodes are in The Diplomat Season 4?
All eight episodes of Season 4 are available to stream.