The Hello Katy Tour was the debut concert tour by American recording artist Katy Perry, in support of her second studio album One of the Boys (2008). The tour visited North America, Europe, Asia, and Australia.

After completing the Warped Tour 2008, Perry announced the tour in November 2008, following the MTV Europe Music Awards 2008, which she hosted. In an interview with Billboard, Perry stated, "I have the guy who creates stages for Madonna working on this tour, I'm indulging my obsession with fruit and cats and designing all different outfits."

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^ a This concert is a part of the South by Southwest Festival.
^ b This concert is a part of the Dinah Shore Weekend.
^ c This concert is a part of the Schaeffer Eye Center Crawfish Boil.
^ d This concert is a part of the Grammy Celebration Concert Tour.
^ e This concert is a part of the Pinkpop Festival.
^ f This concert is a part of the Caribana Festival
^ g This concert is a part of the Hurricane Festival
^ h This concert is a part of the Southside Festival
^ i This concert is a part of the U18 Festival
^ j This concert is a part of the Nibe Festival
^ k This concert is a part of the Rock Werchter
^ l This concert is a part of the Main Square Festival
^ m This concert is a part of the Oxegen
^ n This concert is a part of the T in the Park
^ o These concerts are a part of the V Festival
^ p This concert is a part of the Bumbershoot: Seattle's Music & Arts Festival
^ q This concert is for the benefit of the Typhoon "Ondoy" victims that happened last 23-30 of September, 2009 in the Philippines. Originally scheduled last 3 of October, 2009 but cancelled after Typhoon Ondoy struck the Philippines on 26 of September, 2009, one week before the original scheduled concert.

Katheryn Elizabeth Hudson (born October 25, 1984), known by her stage name Katy Perry, is an American singer, songwriter and actress. Perry grew up with gospel music, and during her first year of high school she pursued a music career as Katy Hudson, releasing her first studio album called Katy Hudson which failed to chart. She recorded a solo album later, which was never released. After signing with Capitol Music Group in 2007, her fourth record label in seven years, she adopted the stage name Katy Perry.

She first gained recognition with the release of her first mainstream album, One of the Boys in 2008, which spawned three Billboard Hot 100 top-ten songs—"I Kissed A Girl", "Hot n Cold" and "Waking Up In Vegas". Perry supported the album with her Hello Katy Tour. In 2010, her third studio album, Teenage Dream (2010), which topped the Billboard 200 chart, and spawned five number one singles—"California Gurls", "Teenage Dream", "Firework", "E.T." and "Last Friday Night (T.G.I.F.)"—Teenage Dream was the only album (after Michael Jackson's Bad)—to do so, and the first female in history to achieve this milestone. She embarked on the California Dreams Tour, which grossed nearly $60 million worldwide. Perry re-released the album under the name of Teenage Dream: The Complete Confection on March 26, 2012, and the re-release has already spawned the number-one single "Part of Me".