"Lighthouse" is the third single by American, British and Canadian girl group G.R.L., and the first single following the death of group member Simone Battle, who died in 2014. The song features songwriting credits from Lukasz Gottwald, and Henry Walter, with production credits from Gottwald and Walter under their production monikers, Dr. Luke and Cirkut. The track was released on January 15, 2015. "Lighthouse" was recorded in the memory of Battle.

The song's accompanying music video was directed by Daniel Carberry. It features footage and photos of Battle during her time with G.R.L., while the group sing in a room filled with hanging light bulbs. "Lighthouse" was supposed to be the final single released by G.R.L., as the group disbanded in June 2015. However, the group reunited the following year with the intention of releasing new music.

On September 5, 2014, band member Simone Battle died by suicide in her home, three months after the release of G.R.L.'s debut single "Ugly Heart". Member Lauren Bennett recalled, "We'd just been in rehearsals the day before, learning choreography for our show, and the next day we were starting the morning as usual when we got the call. I still can't believe it. I don't think any of us can. It's weird that we're even sitting here, talking about it." Paula Van Oppen stated that everything "came to a stop" for the group and it took four months for them to come together and discuss their future. They did not want to start recording an album, instead they teamed up with Give an Hour, an American organization that helps raise awareness of mental health issues. The band wanted the topic of mental health and depression to be talked about more openly, especially among their younger fans, as well as what signs to look out for. Van Oppen explained that she and the other members of G.R.L. were unaware of what Battle was going through in the lead up to her death, so they wanted to spread the message that it was okay to talk about mental health and help people.

The song was co-written by Cirkut and Rock City.Dr. Luke and Cirkut approached the group with the song, and they thought it expressed how they were all feeling at the time. The group recorded "Lighthouse" in memory of Battle. It is a ballad about "being there for your friends". Bennett commented that recording the song without Battle was one of the hardest things they had ever done. She also said, "It's a positive message, a positive song, and I think it's gonna be great moving forward with the charity we're going to associate with. We really want to try and fit everything hand in hand."Emmalyn Estrada added that G.R.L. were taking things slowly, but were focused on the song and "the positive message overall, about being together in hard times."

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