The second season of True Detective, an American anthology crime drama television series created by Nic Pizzolatto, began airing on June 21, 2015, on the premium cable network HBO.

With a principal cast of Colin Farrell, Rachel McAdams, Taylor Kitsch, Kelly Reilly, and Vince Vaughn, the season comprises eight episodes and concluded its initial airing on August 9, 2015.

In a 2016 interview on KPCC's The Frame, Michael Lombardo, President of Programming at HBO, stated "Our biggest failures — and I don’t know if I would consider True Detective 2 — but when we tell somebody to hit an air date as opposed to allowing the writing to find its own natural resting place, when it’s ready, when it’s baked — we’ve failed."

At one point, early media reports named Cate Blanchett, Josh Brolin, Joaquin Phoenix, Garrett Hedlund, Michael Fassbender, Jessica Chastain, Christian Bale, Elisabeth Moss and Brad Pitt to be among a raft of potential candidates for the leads.

The site's critical consensus reads, "Despite some memorably grizzled performances, True Detective's second season is florid to a fault and so unrelentingly grim that it becomes about as much fun as being stuck in L.A.

[55] David Hinckley of the New York Daily News gave it a very positive review, and wrote "It's still the kind of show that makes TV viewers reach for phrases like 'golden age of television drama'" and that "the second installment of True Detective goes out of the way not to echo the first.

"[56] Hank Stuever of The Washington Post gave it a generally positive review, praising the performances, and wrote, "There is something still lugubrious and overwrought about True Detective, but there's also a mesmerizing style to it — it's imperfect, but well made.

"[57] A more mixed review came from Brian Lowry of Variety, who wrote "Although generally watchable, the inspiration that turned the first [season] into an obsession for many seems to have drained out of writer Nic Pizzolatto's prose.

In addition to the eight episodes, both formats contain bonus content including a making-of featurette of "The Vinci Massacre", interviews with cast and crew, audio commentary for "Down Will Come" by Nic Pizzolatto, Colin Farrell, Vince Vaughn, Taylor Kitsch and Rachel McAdams, and an audio commentary for "Omega Station" by Nic Pizzolatto, Scott Stephens, Colin Farrell and Vince Vaughn.