The Diplomat season 4 does not have a confirmed exact release date yet, but current reporting says it is expected to arrive on Netflix in 2026. Coverage from late 2025 and early 2026 says the season was already in production, and a April 2026 update said filming was still continuing through June.

What’s known now

  • Netflix has confirmed the show is returning for season 4.
  • Multiple entertainment reports describe it as a 2026 return rather than giving a specific day.
  • One update in April 2026 said filming was ongoing and would continue through June, which suggests the release date is still being finalized.

Practical expectation

A realistic guess is later in 2026 , since production was still active in spring and early summer. Until Netflix announces a date, the safest answer is that season 4 is coming in 2026, but the exact release date is not public yet.