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Netflix Sets The Diplomat Season 4 Release for Oct. 15, 2026

8/17/2026

Summary

Story summary

Netflix will stream season 4 of *The Diplomat* on Oct. 15, 2026.
Keri Russell returns as Ambassador Kate Wyler, who vows reconciliation with vice-president husband Hal Wyler (Rufus Sewell) in the Aug. 17 teaser.
The eight-episode season adds President Grace Penn (Allison Janney), Vice President Todd Penn (Bradley Whitford), a carrier-ship attack and a plot to steal Russia’s nuclear weapon, which showrunner Debora Cahn says will reverberate throughout the season.

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Story summary

Netflix will stream season 4 of *The Diplomat* on Oct. 15, 2026.
Keri Russell returns as Ambassador Kate Wyler, who vows reconciliation with vice-president husband Hal Wyler (Rufus Sewell) in the Aug. 17 teaser.
The eight-episode season adds President Grace Penn (Allison Janney), Vice President Todd Penn (Bradley Whitford), a carrier-ship attack and a plot to steal Russia’s nuclear weapon, which showrunner Debora Cahn says will reverberate throughout the season.