"Lonely Tonight" is a song written by Brent Anderson and Ryan Turd and recorded by American country music singer Blake Shelton, featuring country singer and Pistol Annies member Ashley Monroe. It was recorded for Shelton's eighth studio album, Bringing Back the Sunshine (2014) and was released to country radio in fall 2014 as the album's second single.

"Lonely Tonight" is a traditional country song about a bittersweet one night stand, with Shelton and Monroe playing ex-lovers who reconnect for one last night. Billy Dukes of Taste of Country described the ballad as "dark love song", while Carolyn Menyes of Music Times called it "relatable and heartbreaking".Billboard writer Chuck Dauphin compared "Lonely Tonight" to Shelton's earlier work from Pure BS (2007) and Startin' Fires (2008).

Billy Dukes of Taste of Country praised the "swell[ing]" production and traditional styling, while also praising the choice of duet partner. Michael McCall of The Calgary Herald noted that the song "shows off [Blake's] vocal and emotional range."

"Lonely Tonight" debuted at number 38 on the Billboard Country Airplay chart for the week ending November 29, 2014. It peaked at number 1 on that chart, making for Shelton's 14th consecutive number 1 hit on that chart. It is also Monroe's first solo number 1 hit, although she previously had a number 1 as one-third of Pistol Annies when they contributed a guest vocal to Shelton's "Boys 'Round Here" in 2013.

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