“Slow Horses” currently has 5 seasons, and each season has 6 episodes, for a total of 30 episodes so far.

Episode count overview

  • Season 1: 6 episodes.
  • Season 2: 6 episodes.
  • Season 3: 6 episodes.
  • Season 4: 6 episodes.
  • Season 5: 6 episodes, following the same pattern as earlier seasons.

So if you’re starting from scratch and want to watch everything that’s out as of late 2025, you’re looking at 30 tightly written spy-thriller episodes in total.

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