Zachary Knight Galifianakis (born October 1, 1969) is an American actor and comedian. He appeared in a Comedy Central Presents special and presented his own talk show, Between Two Ferns with Zach Galifianakis, which earned critical acclaim. He was nominated for the Primetime Emmy Award for Outstanding Lead Actor in a Comedy Series in 2017.

Galifianakis has starred in films including The Hangover trilogy (2009–2013), Due Date (2010), It's Kind of a Funny Story (2010), The Campaign (2012), Birdman or (The Unexpected Virtue of Ignorance) (2014) and Masterminds (2016). He has also voiced characters in animated films such as Puss in Boots (2011), The Lego Batman Movie (2017), Missing Link (2019), Ron's Gone Wrong (2021) and The Bob's Burgers Movie (2022).