Katy Perry – Smile

Engineer [Assistant] – Brian Cruz
Engineer, Mixed By [Additional] – Ryan Shanahan
Written-By – Dagny Norvoll Sandvik
Written-By – Michelle Buzz
Written-By – Jason Gill
Written-By, Backing Vocals – Gino Barletta
Written-By, Backing Vocals – Hayley Warner
Written-By, Producer, Mixed By, Programmed By – Anton Zaslavski
Written-By, Producer, Programmed By – Daniel James
Written-By, Producer, Programmed By, Backing Vocals – Leah Haywood
Written-By, Vocals – Katy Perry

Engineer – Jeremy Lertola
Engineer – Cory Bice
Engineer – Sam Holland
Engineer [Mix] – John Hanes
Guitar – Rickard Göransson
Mixed By – Serban Ghenea
Written-By, Backing Vocals – Noonie Bao
Written-By, Backing Vocals – Sasha Sloan
Written-By, Producer, Programmed By, Drums, Bass, Keyboards – Oscar Holter
Written-By, Vocals, Backing Vocals – Katy Perry

Engineer – Rachael Findlen
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer, Programmed By, Drums, Bass, Keyboards, Percussion – Oscar Görres
Written-By, Backing Vocals – Madison Love
Written-By, Backing Vocals – Jacob Kasher Hindlin
Written-By, Producer, Recorded By [Vocals], Producer [Vocals], Guitar, Programmed By, Drums, Bass, Keyboards, Percussion, Backing Vocals – Andrew Goldstein
Written-By, Synth, Backing Vocals – Michael Pollack (5)
Written-By, Vocals – Katy Perry

Engineer – Rachael Findlen
Engineer [Mix] – John Hanes
Guitar – Pierre-Luc Rioux
Mixed By – Serban Ghenea
Producer [Vocals] – Gian Stone
Producer, Recorded By [Vocals], Producer [Vocals] – The Monsters & Strangerz
Written-By – Stefan Johnson
Written-By – Jordan Johnson (2)
Written-By – Jacob Kasher Hindlin
Written-By, Backing Vocals – Jon Bellion
Written-By, Guitar – Michael Pollack (5)
Written-By, Vocals – Katy Perry

Engineer – Thomas Warren (2)
Engineer [Mix] – John Hanes
Executive-Producer – Dancin' Danny D
Executive-Producer – Tim Blacksmith (3)
Mixed By – Serban Ghenea
Written-By – Ferras Alqaisi
Written-By, Producer, Engineer, Programmed By, Instruments – Mikkel S. Eriksen
Written-By, Producer, Programmed By, Instruments – Tor Erik Hermansen
Written-By, Vocals – Katy Perry

Engineer – Rachael Findlen
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer, Keyboards, Programmed By – Oscar Görres
Written-By – Jacob Kasher Hindlin
Written-By, Backing Vocals – Madison Love
Written-By, Piano, Backing Vocals – Michael Pollack (5)
Written-By, Producer, Recorded By [Vocals], Producer [Vocals], Keyboards, Programmed By, Guitar, Backing Vocals – Andrew Goldstein
Written-By, Vocals – Katy Perry

Backing Vocals – Kamaria Ousley
Engineer – Darth "Denver" Moon
Engineer – Louie Gomez
Engineer – CJ Mixed It
Engineer – Blake Harden
Engineer [Mix Assistant] – Scott Desmarais
Engineer [Mix Assistant] – Robin Florent
Engineer [Mix] – Chris Galland
Mixed By – Manny Marroquin
Producer [Additional] – G Koop
Saxophone – Lincoln Adler
Trumpet – Dave Richards (9)
Written-By – Anthony Shawn Criss
Written-By – Vinnie Brown
Written-By – Brittany Hazzard
Written-By – Kier Gist
Written-By – Benny Golson
Written-By – Ferras Alqaisi
Written-By, Producer – Josh Abraham
Written-By, Producer – Oliver Goldstein
Written-By, Vocals – Katy Perry

Cello – David Bukovinszky
Engineer – Jeremy Lertola
Engineer – Cory Bice
Engineer – Rachael Findlen
Engineer – Sam Holland
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Peter Carlsson (3)
Synthesizer [Strings], Arranged By [Strings] – Nils-Petter Ankarblom
Synthesizer [Strings], Recorded By [Strings], Edited By [Strings] – Mattias Bylund
Violin – Mattias Johansson
Written-By – Ian Kirkpatrick
Written-By – Jacob Kasher Hindlin
Written-By, Producer – John Ryan (17)
Written-By, Producer, Programmed By, Keyboards, Arranged By [Strings] – Johan Carlsson (4)
Written-By, Vocals – Katy Perry

Alto Saxophone – Wojtek Goral
Arranged By [Horns] – Nils-Petter Ankarblom
Engineer – Jeremy Lertola
Engineer – Cory Bice
Engineer – Sam Holland
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Peter Carlsson (3)
Recorded By [Horns], Edited By [Horns], Synthesizer [Horns], Arranged By [Horns] – Mattias Bylund
Tenor Saxophone, Baritone Saxophone – Tomas Jonsson (4)
Trombone, Tuba – Peter Noos Johansson
Trumpet – Magnus Johansson
Trumpet – Jan Bjerger
Written-By – Ferras Alqaisi
Written-By – Jacob Kasher Hindlin
Written-By, Producer – John Ryan (17)
Written-By, Producer, Programmed By, Keyboards – Johan Carlsson (4)
Written-By, Vocals – Katy Perry

Engineer – Jeremy Lertola
Engineer – Cory Bice
Engineer – Rachael Findlen
Engineer – Sam Holland
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Peter Carlsson (3)
Written-By – Jacob Kasher Hindlin
Written-By, Producer, Programmed By, Guitar, Electric Piano [Fender Rhodes], Backing Vocals – Johan Carlsson (4)
Written-By, Producer, Programmed By, Synthesizer, Backing Vocals – Charlie Puth
Written-By, Vocals – Katy Perry

Electric Piano [Rhodes], Organ, Piano – Brad Oberhofer
Engineer [Mix] – John Hanes
Handclaps, Percussion, Vocals [Gang] – Sachi DiSerafino
Handclaps, Percussion, Vocals [Gang] – Lila Drew
Mixed By – Serban Ghenea
Producer [Vocals] – Svend Lerche
Producer, Engineer, Producer [Vocals], Drum Programming, Guitar, Synth, Programmed By [Synth], Programmed By [String], Arranged By, Effects [Vocal Chops], Handclaps, Percussion, Vocals [Gang] – John DeBold
Vocals [Gang] – Karissa Reynafarje
Written-By – Andrew Jackson (17)
Written-By, Producer [Additional], Backing Vocals – Sophie Frances Cooke
Written-By, Vocals – Katy Perry

Co-producer, Programmed By, Electric Guitar, Organ, Bass, Drums, Backing Vocals – Elvira Anderfjärd
Engineer – Jeremy Lertola
Engineer – Cory Bice
Engineer – Sam Holland
Engineer [Mix] – John Hanes
Mixed By – Serban Ghenea
Producer [Vocals] – Peter Carlsson (3)
Written-By – Sarah Hudson
Written-By – Jacob Kasher Hindlin
Written-By, Electric Guitar – John Ryan (17)
Written-By, Producer, Producer [Vocals], Programmed By, Acoustic Guitar, Shaker, Synthesizer, Electric Guitar – Johan Carlsson (4)
Written-By, Vocals – Katy Perry