A
| Name | Show | Series | Notes |
| Aaron Benton | Big Brother Australia | 2 | |
| Abergail "Abby" Brigette Plaatjes | Big Brother Africa | 1 | |
| Abdul Hakim | Big Brother: The Boss | 1 | |
| Abdullah Bishara | Big Brother: The Boss | 1 | |
| Achim Löbig | Big Brother (Germany) | 5 | |
| Ad Visser | Big Brother VIPs (Netherlands) | 1 | |
| Adans López Peres | Gran Hermano VIP (Spain) | 2 | |
| Adele Roberts | Big Brother (UK) | 3 | |
| Inmaculada "Adi" Villaespesa | Gran Hermano VIP (Spain) | 2 | |
| Adria Okins | Big Brother (U.S.) | 5 | |
| Adrian Nadolski | Big Brother (Poland) | 4 | |
| Adrián Uribe | Big Brother VIP (Mexico) | 2 | |
| Adrian | Big Brother (Romania) | 1 | |
| Adriana Xenides | Celebrity Big Brother (Australia) | 1 | |
| Adriano de Castro | Big Brother Brasil | 1 | |
| Afi Oubaibra | Big Brother VIPs (Belgium) | 2 | |
| Agata Gawęda | Big Brother (Poland) | 4 | |
| Agnethe | Big Brother Norge | 3 | |
| Agnieszka Frykowska | Big Brother (Poland) | 3 | |
| Agnieszka Koziołek | Big Brother (Poland) | 3 | |
| Agnieszka Lorek | Big Brother (Poland) | 2 | |
| Agustín Belforte | Gran Hermano (Argentina) | 4 | |
| Agustinho Fernandes Mendonça | Big Brother Brasil | 6 | |
| Ahmed Aghil | Big Brother (UK) | 5 | |
| Aída Nízar | Gran Hermano (Spain) | 5 | |
| Aida Sharizadeh-Abdi | Big Brother (Denmark) | 2 | |
| Ainhoa Pareja | Gran Hermano (Spain) | 5 | |
| Airton da Silva | Gran Hermano Brasil | 7 | |
| Aisleyne Horgan-Wallace | Big Brother (UK) | 7 | |
| Aki Abiodu | Big Brother Suomi | 3 | |
| Ala'a Omar | Big Brother: The Boss | 1 | |
| Alan Henrique dos Santos | Big Brother Brasil | 5 | |
| Erick "Alan" Ibarra Miramontes | Big Brother VIP (Mexico) | 1 | |
| Alan Marcelo Cavalcante | Big Brother Brasil | 3 | |
| Alan Zulcovsky | Gran Hermano | 5 | |
| Alan-Pierre de Carvalho | Big Brother Brasil | 7 | |
| Alana Dante | VIP Big Brother | 1 | |
| Albert Sosnowski | Big Brother VIP (Poland) | 1 | |
| Alberto Pimentel | Big Brother Brasil | 7 | |
| Aldo Pucci | Grande Fratello | 5 | |
| Aldred Marc Gatchalian | Pinoy Big Brother: Teen Edition | 1 | |
| Aldrico Amando | Big Brother (Netherlands) | 3 | |
| Aleck Bovick | Pinoy Big Brother: Celebrity Edition | 1 | |
| Alecko Akšamija | Big Brother (Sweden and Norway) | 1 | |
| Aleisha Lee Cowcher | Big Brother Australia | 7 | |
| Alejandra Margarita Ávalos Rodríguez | Big Brother VIP (Mexico) | 4 | |
| Alejandra Martínez | Gran Hermano (Argentina) | 2 | |
| Alejandra Procuna | Big Brother VIP (Mexico) | 4 | |
| Alejandro Ibarra | Big Brother VIP (Mexico) | 1 | |
| Alejandro Rastuccia | Gran Hermano (Argentina) | 1 | |
| Alejandro Solís | Big Brother México | 2 | |
| Aleksandar Jovanović | Serbia | VIP1 | |
| Aleksandra Đukić | Serbia Proba | 1 | |
| Aleksandra Vrbajac | Serbia | 1 | |
| Alen Macinić | Big Brother (Croatia) | 1 | |
| Alen | Big Brother (Slovenia) | 1 | |
| Aleš | Big Brother (Slovenia) | 1 | |
| Alessandra Bigliomini (Leka) | Big Brother Brasil | 1 | |
| Alessandra Micciché | Grande Fratello | 5 | |
| Alessandra Zannin | Big Brother (Sweden/Norway) | 1 | |
| Alessandro Comune | Big Brother (Germany) | 5 | |
| Alessandro Luckas | Grande Fratello | 2 | |
| Alessandro Tersigni | Grande Fratello | 7 | |
| Alessandro "Alex" Capone | Grande Fratello | 5 | |
| Alex Christie | Big Brother Australia | 2 | |
| Alexander "Alex" Geis | Big Brother (Germany) | 6 | |
| Alex Jolig | Big Brother (Germany) | 1 | |
| Alexander "Alex" Kasembeli Holi | Big Brother Africa | 1 | |
| Alex Melchior | Big Brother (Germany) | 2 | |
| Alexander "Alex" Nilsson | Big Brother Sverige | 2 | |
| Alex Sibley | Big Brother (UK) | 3 | |
| Alexandre Ouellet | Loft Story (Canada) | 2 | |
| Alexandros Moschos | Big Brother (Greece) | 2 | |
| Alexandros Trjantafylljdis | Big Brother (Greece) | 4 | |
| Alfio Dessì | Grande Fratello | 5 | |
| Alfonso De Nigris | Big Brother México | 2 | |
| Alfonso di Nigris | Big Brother México | 3 | |
| Alfredo Lo Bianco | Grande Fratello | 7 | |
| Ali Can | Big Brother (Germany) | 5 and 6 | |
| Alicja Deręgowska | Big Brother (Poland) | 2 | |
| Alicja Walczak | Big Brother (Poland) | 1 | |
| Alice Redwood | Big Brother Australia | 8 | |
| Alida Nadine Kurras | Big Brother (Germany) | 2 | |
| Alida | Big Brother (Romania) | 1 | |
| Alidjan Aliev | Big Brother (Bulgaria) | 1 | |
| Aline Cristina | Big Brother Brasil | 5 | |
| Alisa | Big Brother (Slovenia) | 1 | |
| Alison Hammond | Big Brother (UK) | 3 | |
| Alison Irwin | Big Brother (U.S.) | 4 | |
| Alison Irwin | Big Brother: All-Stars | 1 | |
| Allan Petersen | Big Brother All Stars (Denmark) | 1 | |
| Allando | Big Brother All Stars (Denmark) | 1 | |
| Almperto Nti Matzisio | Big Brother (Greece) | 3 | |
| Alonso Jiménez | Gran Hermano (Spain) | 2 | |
| Juan "Alvaro" Montalván Aspiazu | Gran Hermano (Ecuador) | 1 | |
| Aly | Big Brother (Romania) | 2 | |
| Alzira Andrade | Big Brother (Portugal) | 4 | |
| Amal Saleh | Big Brother: The Boss | 1 | |
| Amalia Granata | Gran Hermano Famosos | 1 | |
| Amalia Mitsoy | Big Brother (Greece) | 2 | |
| Amanda Craig | Big Brother (U.S.) | 4 | |
| Amanda Marchant | Big Brother (UK) | 8 | |
| Amber Tomcavage | Big Brother (U.S.) | 8 | |
| Amelie Eisen | Big Brother Sverige | 2 | |
| Amit Sadh | Bigg Boss | 1 | |
| Amma Boatema Antwi-Agyei | Big Brother (UK) | 2 | |
| Amor Romeira | Gran Hermano (Spain) | 9 | |
| Amy Alexandra | Big Brother (UK) | 8 | |
| Amy Crews | Big Brother (U.S.) | 3 | |
| An Jaspers | Big Brother VIPs | 2 | |
| An Van Heeck | Big Brother Belgium | 5 | |
| Ana Gotovac | Big Brother (Croatia) | 1 | |
| Ana Marcela Tourné | Big Brother México | 2 | |
| Ana Maria Giraldo | Gran Hermano (Colombia) | 1 | |
| Ana Marija Sokolovic | Big Brother (Germany) | 3 | |
| Ana Vrdoljak | Big Brother (Croatia) | 3 | |
| Anabella Pezet Batiz | Big Brother México | 3 | |
| Analía Barrios | Gran Hermano (Argentina) | 3 | |
| Analy Ofenböck | Big Brother Brasil | 7 | |
| Anamarija Kikoš | Serbia | 1 | |
| Anastasja Capotosti | Big Brother (Germany) | 6 | |
| Anastasy Glushchenko | большой брат | 1 | |
| Anastasy Jagajlova | большой брат | 1 | |
| Andalla | Gran Hermano (Spain) | 9 | |
| Anders Foss | Big Brother (Sweden/Norway) | 1 | |
| Andrea "Andi" Kapitány | Big Brother Nagy Testvér | 1 | |
| Andre Burger | Big Brother South Africa | 2 | |
| André Gabeh | Big Brother Brasil | 1 | |
| André Nieblas | Big Brother (Germany) | 6 | |
| André Vincent | Loft Story (Canada) | 3 | |
| Andrea Francolino | Grande Fratello | 3 | |
| Andrea Guerrero | Big Brother Brasil | 3 | |
| Andrea Murillo | Gran Hermano (Colombia) | 1 | |
| Andrea Rincón | Gran Hermano (Argentina) | 5 | |
| Andrea Singh | Big Brother (Germany) | 1 | |
| Andrea Spadoni | Grande Fratello | 7 | |
| Andreas Manoysos | Big Brother (Greece) | 4 | |
| Andreea | Big Brother (Romania) | 1 | |
| Andreea | Big Brother (Romania) | 2 | |
| Andrej Novak | Big Brother (Slovenia) | 1 | |
| Andrés Barreiro González | Gran Hermano (Spain) | 3 | |
| Andrés Ogliastri | Gran Hermano (Colombia) | 1 | |
| Andrew Temment | Big Brother Australia | 7 | |
| Andriana Olsson | Big Brother Sverige | 2 | |
| Andries de Jong | Big Brother (Netherlands) | 3 | |
| Andrzej Galica | Big Brother (Poland) | 3 | |
| Andrew "Andy" Davidson | Big Brother (UK) | 1 | |
| Andy Silva | Big Brother Australia | 1 | |
| Anelia Ivanova | Big Brother (Bulgaria) | 1 | |
| Aneta Bielecka & Martyna Bielecka | Big Brother (Poland) | 4 | |
| Anette Young | Big Brother Norge | 1 | |
| Ángel Barrachina | Gran Hermano (Spain) | 6 | |
| Ángel García | Gran Hermano (Spain) | 2 | |
| Angela Aiken | Big Brother Australia | 5 | |
| Angela Calina | Pinoy Big Brother: Celebrity Edition | 1 | |
| Ángela Carrasco | Gran Hermano VIP (Spain) | 1 | |
| Ángela Linares | Gran Hermano (Spain) | 9 | |
| Angéla Lupsán | Big Brother Nagy Testvér | 1 | |
| Angela Nanni | Loft Story (France) | 2 | |
| Angela Nasca | Big Brother Sverige | 4 | |
| Angela Sozzio | Grande Fratello | 3 | |
| Angelica Bremert | Big Brother (Sweden/Norway) | 2 | |
| Angelica Freij | Big Brother Sverige | 1 | |
| Ania Iglesias | Gran Hermano (Spain) | 1 | |
| Anibal | Big Brother (Portugal) | 3 | |
| Anick Berghmans | Big Brother (Belgium) | 3 | |
| Anita Bloomfield | Big Brother Australia | 1 | |
| Anita E. Sundt Olsen | Big Brother Norge | 1 | |
| Anita Heilker | Big Brother VIPs (Netherlands) | 2 | |
| Anita Walther | Big Brother Norge | 3 | |
| Anja Hansen | Big Brother (Denmark) | 1 | |
| Anja Kerwer | Big Brother (Germany) | 3 | |
| Anke Kremb | Big Brother (Germany) | 6 | |
| Anki Lundberg | Big Brother Stjärnveckan | 1 | |
| Anna Bäckelin | Big Brother Sverige | 1 | |
| Anna Baranowska | Big Brother (Poland) | 1 | |
| Anna Blombäck | Big Brother (Sweden/Norway) | 2 | |
| Anna Buchacz | Big Brother (Poland) | 2 | |
| Anna Franco | Gran Hermano (Spain) | 4 | |
| Anna Hind-Linden | Big Brother Australia | 6 | |
| Anna Hoksa | Big Brother (Poland) | 3 | |
| Anna Kartswli | Big Brother (Greece) | 4 | |
| Anna Masaracchia | Big Brother (Germany) | 7 | |
| Anna Nolan | Big Brother (UK) | 1 | |
| Anna Poliakova | Big Brother (Germany) | 6 | |
| Anna Riis Sprange | Big Brother (Denmark) | 1 | |
| Anna Tsindrenko | большой брат | 1 | |
| Annalisa Caputo | Grande Fratello | 5 | |
| Anne Diamond | Celebrity Big Brother (UK) | 2 | |
| Anne Mona Hansen | Big Brother Norge | 1 | |
| Anneke Grönloh | Big Brother VIPs | 1 | |
| Anneli | Big Brother Stjärnveckan | 1 | |
| Annet Stokkentreeff | Big Brother (Netherlands) | 2 | |
| Annette | Big Brother Sverige | 2 | |
| Annicka Elm | Big Brother (Sweden/Norway) | 1 | |
| Annika | Big Brother: Tilbake I Huset | 1 | |
| Anouk Drost | Big Brother (Netherlands) | 1 | |
| Anouska Golebiewski | Big Brother (UK) | 4 | |
| Anouska Golebiewski | Big Brother Panto (UK) | 1 | |
| Antal Skendžić | Serbia | Proba 1 | |
| Ante Seljak Jakovčev | Big Brother (Croatia) | 3 | |
| Anthea Turner | Big Brother (UK) | 1 | |
| Anthony Hutton | Big Brother (UK) | 6 | |
| Anthony Mundine | Celebrity Big Brother (Australia) | 1 | |
| Antje Monteiro | Big Brother VIPs (Netherlands) | 1 | |
| Anton Granlund | Big Brother (Sweden/Norway) | 2 | |
| Anton Sokolov | большой брат | 1 | |
| Antonela Avellaneda | Big Brother Brasil | 4 | |
| Antonija Blaće | Big Brother (Croatia) | 1 | |
| Antonio Leotta | Grande Fratello | 5 | |
| Antti Asikainen | Big Brother Suomi | 1 | |
| Antti Saastamoinen | Big Brother Suomi | 1 | |
| Anupama Varma | Bigg Boss | 1 | |
| Anzhela Kolcova | Big Brother VIP (Poland) | 1 | |
| Aom Am | Big Brother Thailand | 1 | |
| Aphrodite Vuitton | Big Brother Australia | 4 | |
| April Lewis | Big Brother (U.S.) | 6 | |
| Aramoga | Gran Hermano (Spain) | 9 | |
| Arath de la Torre Balmaceda | Big Brother VIP (Mexico) | 1 | |
| Aravier Batiz Rodriguez | Big Brother México | 3 | |
| Arcenia Cabezas | Gran Hermano (Colombia) | 1 | |
| Ari Soidinmäki | Big Brother Suomi | 2 | |
| Ariana Pakitzé | Big Brother (Greece) | 3 | |
| Arkadiusz Batorski | Big Brother (Poland) | 3 | |
| Arkadiusz Nowakowski | Big Brother (Poland) | 2 | |
| Arkady Maryin | большой брат | 1 | |
| Arleth Rocío Terán Sotelo | Big Brother VIP (Mexico) | 1 | |
| Arsen Kelley K. (hr:Arsen Kelley) | Big Brother (Croatia) | 4 | |
| Arthur van Gijzel | Big Brother (Netherlands) | 4 | |
| Arturo Carmona | Big Brother VIP (Mexico) | 4 | |
| Arturo Sisniega | Gran Hermano (Spain) | 7 | |
| Aryan Vaid | Bigg Boss | 1 | |
| Ascanio Pacelli | Grande Fratello | 4 | |
| Ashalea McWalters | Big Brother Australia | 4 | |
| Ashlea Evans | Big Brother (U.S.) | 6 | |
| Michael "Ashley" Cox | Big Brother Australia | 6 | |
| Astrid Verpooten | Big Brother (Belgium) | 6 | |
| Asjan Hadad | Big Brother: The Boss | 1 | |
| Audrey De Preter | Big Brother (Belgium) | 5 | |
| Audrey | Big Brother (Netherlands) | 3 | |
| Augusto Alvarez Penaranda | Gran Hermano del Pacífico | 1 | |
| Augusto De Megni | Grande Fratello | 6 | |
| Aum | Big Brother Thailand | 2 | |
| Aurore Vangu | Big Brother (Belgium) | 2 | |
| Autumn Daly | Big Brother (U.S.) | 2 | |
| Axel | Big Brother Famosos | 2 | |
| Azalia Ojeda | Big Brother México | 1 | |
| Azalia Ojeda | Big Brother México | 3 | |
| Vasil "Azis" Trojanov Bojanov | VIP Brother | 2 | |
| Abdel-Aziz "Aziz" Essayed | Loft Story (France) | 1 |
Read more about this topic: List Of Big Brother Housemates