The fourth season of the animated television series BoJack Horseman premiered exclusively via Netflix's web streaming service on September 8, 2017.

The site's critical consensus states: "BoJack Horseman's fourth season finds the show continuing to traverse the emotional gamut - with results that are heartbreaking as often as they are hilarious.

BoJack's signature tropes — the background visual jokes, the animal puns, the brutal moments of sadness — remain reliably consistent, but turns the focus largely inward, ensuring that some of the more outlandish plots support and highlight the more emotional storylines".

[4] The Washington Post lauded the season, praising the installment as "moving and unexpected" and that "it offers hope but never ignores the sorrows that are inevitable in real life".

[5] The New York Times also gave a positive review, commenting that the "material has the snap and the poignancy we've grown accustomed to" and that "while nothing matches the adventurousness of Season 3's underwater awards show episode, Season 4's ninth episode — narrated from the future by a distant descendant of Carolyn's — is a devastating example of what BoJack can do at its best".