Birth Chart and Horoscope of May 21 births
- Adam Malcher
- Ademar Benítez
- Adolfo Fernández
- Adrian Hardiman
- Alan Gelfant
- Aleix Suñé
- Alex Porto
- Alexander Evgenievich Ponomarev
- Amelia Todhunter
- Andrei Sakharov
- Anita Ratnam
- Ann McNamee
- Ansgar Gabrielsen
- Anthony Grafton
- Ara Raoul Parseghian
- Arthur Russell (musician)
- Artur Akhmatkhuzin
- Ayodele Peters
- Aída Román
- Bambale Osby
- Beau Falloon
- Ben Lemon
- Benoît Piffero
- Bent Jensen (equestrian)
- Bianca Bagnarelli
- Bill Abbott Jr.
- Blair Parry-Okeden
- Brent Briscoe
- Brett Feese
- Buti Khoza
- Camille de Rocca Serra
- Carl Carlton
- Carlos Fondacaro
- Chase Baker
- Christine Larson-Mason
- Claire Cashmore
- Cody Johnson
- Craig Cook
- Craig Huby
- Da'Vine Joy Randolph
- Dale Anderson (boxer)
- Damien Lovelock
- Daniel Holloway (cyclist)
- Danny Nightingale
- Danuta Lubowska
- Daria Schneider
- Darrell Strong
- Dave Wannstedt
- David Braz
- David Jay Reed
- Dennis Boyd (basketball)
- Deran Toksöz
- Devin Del Do
- Dickson Nwakaeme
- Djô d'Eloy
- Douglas Galvão Silva
- Eddie Royal
- Edimar Fraga
- Eduardo Verástegui
- Emanuel Carreira
- Emilio Carelli
- Émilie Gex-Fabry
- FIFA
- Felipe Alves Raymundo
- Foots Walker
- Francesco Buglio
- George P. Mitchell
- Gerald Meehl
- Greg Stewart (ice hockey)
- Grigorij Richters
- Guillaume Loriot
- Guillermo Antonio Parada
- Guy-Roland Niangbo
- Hong Jeong-nam
- Idan David
- Idir Ouali
- István Jenei
- Jackson Caucaia
- Jacqueline Tong
- Jakub Tosik
- James Bailey (basketball)
- James G. Stewart
- Jean Kasem
- Jean-François Caron
- Jeanne Moos
- Jerome Randle
- Jill Gilbeau
- Jim Devine
- Johann Carlo
- John Dolinsky
- John E. McDonough
- John Torbett
- Johnny Ward (actor)
- Joni Cotten
- Jonny Howson
- Josh Hull
- Juan Diego Madrigal
- Kaire Leibak
- Kathleen Wynne
- Keith Broomhall
- Kenneth Stern (rugby player)
- Kevin Schindler
- Khalida Popal
- Kim Joo-ri
- Kim Steven Yap
- KingYc
- Ko Sung-hyun
- Kurt Röthlisberger
- Kyle T. Heffner
- Leandro Cuzzolino
- Lee Jong-min (footballer, born 1987)
- Leo Jaraguá
- Liaqat Ali (cricketer)
- Linda Bouchard
- Lisa Edelstein
- Luciano Cilio
- Luis Diego Cordero
- Luis Ramos Jr.
- Luiz Henrique Koprowski
- Lynnie Greene
- Maayan Davidovich
- Madan Ghosh
- Madson (footballer, born 1986)
- Marc Ribot
- Marco Iannuzzi
- Mark Landsberger
- Martin Burt
- Marzia Piazza
- Masato Morishige
- Mateus Paraná
- Matt Bischoff
- Matt Wieters
- Maud Coutereels
- Maurice Buret
- Maurice Nadeau
- Micky Cook (footballer, born 1950)
- Mike Keeler
- Mohamed Chakouri
- Morgan Matthews
- Mr. T
- Mustafa Malayekah
- Myra (singer)
- Nick Sheridan
- Niko Dimitrakos
- Nora Aunor
- Omar Esparza
- Oscar Núñez Oliva
- Óscar Pimentel González
- Ömer Kaner
- Park Gyu-ri
- Paul Barber (field hockey)
- Pedro Larrea
- Peet Poillon
- Peter Brown (ice hockey)
- Pietro Arcidiacono
- Poul Mathias Thomsen
- Priscilla Gagné
- Richie Powling
- Rik Sebens
- Ringo Cantillo
- Robert Agostinelli
- Robert Arrowsmith
- Rodney Bartholomew
- Roger Smith (journalist)
- Roger Young (cyclist)
- Roozbeh Shahalidoost
- Rosa Feola
- Rosa Hasbún
- Rosanna Vergnano
- Rovena Marku
- Rudy Jomby
- Rufus Crawford
- Secundino Aifuch
- Seiya Kishikawa
- Sergio Lobato García
- Seth Klarman
- Sheilah Martin
- Shelley Smith (American football)
- Spencer Lanning
- Staffan Hallerstam
- Stan Lynch
- Steve Litt
- Steven Contursi
- Stomy Bugsy
- Thomas Phibel
- Timothy F. Ritchey
- Tod Ohnstad
- Tom Everhart
- Tomikazu Fukuda
- Tony Hayward
- Torey Hayden
- Trevor Cooper
- Trevor Thompson (footballer, born 1955)
- Udo Kiessling
- Wendy Brown (sprinter)
- Will Hutton
- Willa Schneberg
- Wilson Morelo
- Yaqui López
- Zou Zhongting