Mariette Petra Carola Hansson (born 23 January 1983), sometimes credited as MaryJet or simply Mariette, is a Swedish singer and songwriter. Hansson participated in Sikta mot stjärnorna (Swedish pre-selection for European Soundmix Show) in 1999 imitating singer Amanda Marshall. She is perhaps best known for participating in Idol 2009 which was broadcast in TV4. A year later, Hansson was announced as "homo of the year" at the QX Gaygala in Stockholm.

In 2013 she played guitar in Magnus Ugglas band during his show "Magnus Den Store" at Hamburger Börs in Stockholm. In 2014 she toured along with Ace Wilder who placed second in Melodifestivalen 2014, the Swedish pre-selection for the Eurovision Song Contest.

Mariette Hansson participated as a solo singer in Melodifestivalen 2015 with the song "Don’t Stop Believing", in the second semifinal. She qualified for the final in Friends Arena, eventually reaching the third place in the contest.

She will participate in Melodifestivalen 2017 with the song "A Million Years".