"Lighthouse" is a song by Irish boy band Westlife. It is the lead single from their second compilation album, Greatest Hits. The song is their second final physical single after their announcement to disband. The song was written by Gary Barlow and John Shanks, and was released on 11 November 2011. A music video was filmed in South Africa and premiered on 20 October 2011. The song became their second-lowest charting single in Ireland and their lowest-charting single in the United Kingdom, charting at number eleven and thirty-two respectively.

It is described as an instantly recognisable Westlife classic complete with soaring melodies, rousing lyrics. Band members Mark Feehily and Nicky Byrne discussed the song during a behind-the-scenes look at the music video shoot. They explained, "We were excited to be working with 'the competition'. It's the first time that someone like Gary has written a song for a group in competition with his own. Him and John wrote Patience for Take That, so we are confident that we have a great team of writers. Some people think that we regard Gary as an enemy, but we don't at all. It's cool that he's written a song for us." Shane Filan also stated, "I love the idea of Gary writing a song for us. He's thrown all the rules out of the window"."Lighthouse" was chosen by the record label instead of another new album track, "Beautiful World". It was due to be the lead single from their forthcoming compilation but at the last minute they ditched the song in favour of the latter. Mark said: "It was literally up until a day ago that we were deciding between 'Lighthouse' and 'Beautiful World' for the first single but they went with 'Lighthouse' in the end.", "It's one of the potential single track of the album", "I wasn't too gutted though. Once I write the song I've written it. You can't get too attached and just have to hand it over and forget the fact that you've written it."

The song received its first radio airplay on 30 September 2011, during the prime-time hour on LincsFM with Eddie Shaw. Shortly after the song was played, the hashtag #westlifelighthouse became a trending topic worldwide on Twitter. An official 90-second official preview of the song was released via Soundcloud on 4 October 2011. On 7 October 2011, the single's artwork was unveiled by the band's official website. On 14 October 2011, they launched a new pre-order system for the single by texting 'Westlife' to 80115. This service is only open to users in England and is not compatible with Apple iPhone handsets. The full, high quality radio edit of the song was posted on their YouTube site on 10 October 2011. The pre-order service was released on 23 October 2011.

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