Pain Killer is the sixth studio album by American country music group Little Big Town.

In giving the album a rating of "B+", Bob Paxman of Country Weekly praised the group's vocal harmonies and the songwriting, particularly the songs written by Lori McKenna, but criticized the "overly cluttered" production on some tracks.

[8] Stephen Thomas Erlewine of AllMusic called the album as "the rarest thing in contemporary country, a record with an expansive world-view delivered with a kinetic kick and infallible melodies, a record that gives no indication of where it's going upon first listen but remains compelling upon further spins".

[12] The album was certified platinum by the Recording Industry Association of America (RIAA) for combined sales and album-equivalent units of over a million units.

[13][14] Adapted from Allmusic and Pain Killer liner notes.