"Stay" is a song recorded by Barbadian singer Rihanna for her seventh studio album, Unapologetic (2012). It features guest vocals by Mikky Ekko, and was released as the second single from the album on January 7, 2013. "Stay" was co-written by Ekko and Justin Parker. The song's lyrical content speaks of temptation and the inability to resist true love. Music critics were generally positive in their opinion regarding the balladry, with most describing it as a standout track on the album, though a few labeled it as boring.

Upon the release of Unapologetic, "Stay" charted on multiple charts worldwide. Following its release as a single, it reached number one in Bulgaria, Canada, the Czech Republic, Denmark and Israel and the top five in twenty-four countries worldwide including Australia, France, Germany, New Zealand, Norway, Switzerland and the United Kingdom. It peaked at number three on the US Billboard Hot 100, becoming Rihanna's twenty-fourth top ten on the chart, thus surpassing Whitney Houston's tally. Furthermore, it has charted at number one on the US Pop Songs chart and 16 on the Hot Dance Club Songs chart. Worldwide the single has sold over 10 million copies making it one of the best selling singles of all time.

The song's accompanying music video, directed by Sophie Muller, depicts Rihanna naked in a bathtub filled with cloudy water, while Ekko sings in a separate bathroom. Critics likened the vulnerability and raw emotion in the video to the song itself. Rihanna premiered "Stay" on Saturday Night Live in the United States, while she performed the song in the United Kingdom on the ninth series of The X Factor. Rihanna and Ekko also performed "Stay" at the 2013 Grammy Awards. The track was included on the set list of the majority of her 777 Tour promotional tour dates, in support of the album, while it is included on Rihanna's fifth headlining tour, the "Diamonds World Tour".