The original Dexter TV series has 8 seasons (96 episodes) that aired from 2006 to 2013.

If you’re looking at the wider “Dexter universe” with continuations and spin‑offs, here’s the quick scoop:

  • Dexter (original series): 8 seasons (2006–2013)
  • Dexter: New Blood: 1 season (limited series, 10 episodes, 2021–2022)
  • Dexter: Original Sin: 1 season (10 episodes, released 2024–2025, later canceled after season 1)
  • Dexter: Resurrection: 1 season so far (premiered 2025 and renewed for more)

So, depending on what you mean by “Dexter how many seasons”:

  • Just the original show: 8 seasons.
  • All Dexter-series seasons released so far (Dexter + New Blood + Original Sin + Resurrection season 1): 11 total seasons in the franchise.

Information gathered from public forums or data available on the internet and portrayed here.