"Unconditionally" is a song by American singer Katy Perry. It was released as the second single from her fourth studio album Prism (2013) on October 16, 2013. Inspiration for the song came primarily from a humanitarian trip to Madagascar that Perry made in partnership with UNICEF. Having been surrounded by what she described as unconditional love, she co-wrote it with the song's producers Dr. Luke, Max Martin and Cirkut to reflect that feeling.

"Unconditionally" is a power ballad styled in rock, backed against a bassline and percussion. The song peaked at number 14 on the US Billboard Hot 100 and number 25 on the UK Singles Chart, and while it failed to replicate the commercial success of predecessor "Roar", the song still reached the top ten in 6 countries.

The single release was promoted with an Instagram-based campaign, a lyric video directed by Aya Tanimura and live performances—one of the latter, at the American Music Awards of 2013, was the center of controversy due to accusations of cultural appropriation and racism. Brent Benacorso served as the director for the track's music video, which adopts the theme of love and uses a series of metaphors to enrich its concept.

"Unconditionally" was written by Perry alongside its producers Dr. Luke, Max Martin, and Cirkut. Perry denoted the song as her favorite within the record. She told MTV in November 2013: "I love this song because not only can it be a romantic, intimate song, but it can be about the type of love that a mother has when she sees her first child, or best friends or partners..... It's a transcendent love, it's not just relationship status." She also mentioned that she wrote the song bearing in mind the sentiments she had felt during her UNICEF humanitarian trip to Madagascar in April 2013. Such sentiments inspired her to delve into the theme of unconditional love. She stated that, while on that voyage, Perry and her team would "go in cruisers up the mountain" to see newly constructed schools. After observing a group of children, she realized that even without social networking, they felt "pure", unconditional love towards each other.

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