"Good Luck" is a song recorded by South Korean girl group AOA for their fourth extended play of the same name (2016). It was released as the title track from the EP by FNC Entertainment and distributed by LOEN Entertainment on May 16, 2016 in conjunction with the mini-album. The lyrics were written by Han Seong-ho, Jang Yeon-jeong and Innovators and the music was composed by Matthew Tishler, Aaron Benward and Felicia Barton. To promote the song and the EP, AOA performed "Good Luck" on several South Korean music programs, including Music Bank, Show! Music Core and Inkigayo. A music video for the title track was also released on May 16. The song was a commercial success peaking at number 2 on the Gaon Digital Chart. It has sold over 545,952 digital copies as of July 2016.

"Good Luck" was remade as a Japanese song for the group's the fifth single titled, "Good Luck," from their second Japanese studio album Runway (2016). It was released by Universal Music Japan on August 3, 2016. The single was released in eleven different physical versions and as a digital download in Japan.

"Good Luck" was described as a brassy, slow-burning pop track by Fuse. Adding that the release it's a "nice change for the group, which is boasting a fresh-feeling sound to showcase new textures of their voices".

"Good Luck" was released as a digital download in conjunction with the release of Good Luck EP in Korean in May 16, 2016.

On June 6, 2016 it was announced that the Japanese version of "Good Luck" would be released on August 3, 2016 as AOA's fifth physical single with no further details. The pre-orders for the single started on June 9, 2016, at noon JST. On June 21, cover artworks for eleven versions of the single, including Limited Editions Type A/B/C, Regular Edition, and Limited Members Editions, were revealed. On June 24, through the app Line, the group held a live broadcast, in which they discussed the upcoming release, revealing the prices among others details.

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