Here are the top 200 Meetup Groups according to Meetup.com

Name City Country Focus Members Contact Name
Virtual Java User Group LondonGBvJUGers 16526Simon Maple
Developers-BR São PauloBRDevs 16048Valerio Ferreira
Google Developer Group Silicon Valley Mountain ViewUSGoogle Developers 14166Peter Mooshammer
Tech in Motion Events: San Francisco San FranciscoUSTechnologists 13345Mandy Ivy
Tech in Motion: Washington DC ArlingtonUSTechnologists 12157Mandy Walker
Full Stack Developers Israel Tel Aviv-YafoILFullstackers 11663Lior Kanfi
The New York City Java Meetup Group New YorkUSJava enthusiasts 11536Dario Laverde
New York Software Engineers (NYSE) New YorkUSSoftware Engineers 8998Michael Latulippe
Tech in Motion: Silicon Valley San JoseUSTechnologists 8944Mandy
Istanbul Coders IstanbulTRCoder 8461Selim Öber
Agile Roundabout LondonGBAgile enthusiasts 8420Phill Bateman
Tech in Motion: Los Angeles Los AngelesUSTechnologists 8072Mandy
Tech In Motion: Orange County IrvineUSTechnologists 7686Mandy Walker
Tech in Motion: Philadelphia PhiladelphiaUSTechnologists 7545Mandy
Jforum Stockholm StockholmSEMembers 7390Mattias Karlsson
Hacker Hours New YorkUSHaxors 7249Aidan Feldman
LJC - London Java Community LondonGBJava Developers 7190Barry Cranford
GDG San Francisco @sf_gdg San FranciscoUSTechies 6889Patti Shin
The San Francisco Java User Group San FranciscoUSJava Developers 6827Pieter Humphrey
Silicon Valley Android Developers Palo AltoUSAndroid Developers & Users 6764davidcao01 SVE.io
GDG Ahmedabad AhmedabadINTechnology Explorers 6695Paresh Mayani
Silicon Valley Java User Group Mountain ViewUSJava Developers 6626Kevin Nilson
New York MongoDB User Group New YorkUSMembers 6557MongoDB
Bangalore JAVA User Group (BangaloreJUG) BangaloreINjuggie'z 6400Ranganath.S
Skills Matter - xMatters Keynote Series - Developer Events LondonGBsoftware craftspeople 6274Ariel - Skills Matter
ThoughtWorks Geek Night - NCR DelhiINMembers 5825Avinash Chugh
London App Brewery LondonGBApp Makers 5746Philipp Muellauer
RIoT RaleighUSRIoTers 5505Tom Snyder
Tech Interviews and Competitive Programming Mountain ViewUSSolution Finders 5451Jonathan R.
Learn to code in 2019 LagosNGMembers 5385Adedipo Olagbegi
Arte e Programação São PauloBRPessoas 5290Alexandre Villares
Aprende a Programar con BIT BogotáCONuevos Programadores 5259Cesar
allegro Tech WarsawPLTechs 5181Janek P.
Bay Area Hackathons San FranciscoUSHackers 4907Soham M(InterviewKickstart.com)
The San Francisco Android GDG San FranciscoUSAndroid Developers 4798Ty Smith
Amazon Web Services - Security, Virginia (and metro DC area) HerndonUSMembers 4789Kelly
Find a Tech Job LondonGBCareer Networkers 4740Samantha hepburn
London Software Craftsmanship Community LondonGBSoftware Crafters 4729Sandro Mancuso
Stacja IT Warszawa WarsawPLMembers 4704Maria Nowakowska
The Future is made in Javascript Tel Aviv-YafoILJavascripters 4613Yaron Biton
Women Who Code Berlin BerlinDEMembers 4586Women Who Code
New York Android Developers New YorkUSMembers 4582Kevin Galligan
GOTO Nights CPH CopenhagenDKMembers 4558Tine Grarup
Berlin Hack and Tell BerlinDEHackers 4500Keith Corwin
Bogotá JVM Meetup BogotáCOdevelopers and entrepreneurs 4434Julian Espinel
By ThoughtWorks Tech Talk Series MelbourneAUMembers 4427Karen Dumville
Java Meetup - Bangalore BangaloreINDukes 4379Ganesh Samarthyam
Developer User Group JohannesburgZASoftware Developers 4336Robert MacLean
GDG Cambridge, Boston and Metro, Google Developer Group CambridgeUSMembers 4313Steven Max Patterson
Hyderabad Hadoop, Data science, AWS and IOT Group HyderabadINMembers 4236Arun Sirimalla
AI Users Group UK LondonGBAI Specialists 4223Dan Harvey
Istanbul Spring Meetup IstanbulTRMembers 4188Erdem Gunay
Neo4j - London User Group LondonGBPeople 4168Neo4j
GDG Paris ParisFRParticipants 4054Alain Regnier
Paris Android User Group ParisFRMembres 4050Stephane Guerin
Delhi MongoDB User Group DelhiINMembers 4044MongoDB
São Paulo Java Meetup São PauloBRJaveiros 4008Bruno Marinho
Bay Area Android Developer San FranciscoUSDevelopers 3977Stephan Branczyk
Istanbul Java User Group (JUG) - @jug_istanbul IstanbulTRMembers 3932Altug Bilgin Altintas
Melbourne Web Developers MelbourneAUDevs 3815Emma
AWS Seattle | Official Events SeattleUSMembers 3779Ross Barich
GDG Jakarta JakartaIDDevelopers 3697Putri Izzati
Seattle Android Developers SeattleUSAndroid Developers 3687Chris Pick
ExpertTalks Manchester ManchesterGBExperts 3637Jon Dickinson
Utah Java Users Group Salt Lake CityUSTechnologists 3629Jason Porter
ny-scala New YorkUSScala Types 3608Stewart Stewart
London Scala Users' Group LondonGBEnthusiasts 3578Andy Hicks
Boston Software Engineers BostonUSSoftware Engineers 3536Michael Latulippe
Bay Area Full Stack Mountain ViewUSnvirters 3534Vikram Dham
Code Oregon PortlandUSStudents 3529Jenny W
GOTO Nights - London, UK LondonGBFriends 3525Maria Wennestam
IT w Warszawie WarsawPLMembers 3503Jadex
Denver Java Users Group DenverUSJava Developers 3431Matt Raible
Mexico City JVM Group México CityMXDiscípulos JVM 3418JVM MX Organizer
Memphis Technology User Groups MemphisUSTechies 3398Bryan Robinson
Developers Tel Aviv Tel Aviv-YafoILDevelopers 3390James Lebowitz
Java User Group Hamburg HamburgDEMitglieder 3372Uwe Sauerbrei
GOTO Nights Amsterdam AmsterdamNLGotos 3353GOTO Nights
GDG Kraków KrakówPLMembers 3307Mateusz Herych
Tech Talk DC ArlingtonUSPolyglots 3255Doguhan Uluca
Android In Asia SingaporeSGAndroid Developers & Users 3220Khang Toh
Java User Group - Hyderabad HyderabadINJava Nizams 3159Stephen Chin
NYC Tech Talks New YorkUSNYC Techies 3139Greg Whalin
IT Development Café AmsterdamNLDevelopment Heroes 3126Janice Wildenburg
Cleveland Big Data User Group ClevelandUSSuper Hadoopers 3117Doug Meil
Java.IL - the Israeli Java Community Tel Aviv-YafoILDevelopers 3103Haim Yadid
WSO2 - Sri Lanka ColomboLKMembers 3099WSO2
Polyglot Languages & Runtimes (Java, JVM, nodejs, Swift...) BangaloreINMembers 3094Gireesh Punathil
NYC Codecademy Group New YorkUSCoders 3059Codecademy Staff
Silicon Valley Mobile Developer meetup Palo AltoUSdevs 3045Suyash Joshi
eBay Europe Technology BerlinDEeBay Hackers 3019Katja Sommer
Boston Apache Spark User Group CambridgeUSSpahk Enthusiasts 2989Joseph Kambourakis
Paris.py (Python, Django & friends) ParisFRPythonistas 2982Sylvain Zimmer
Java User Group Łódź ŁódźPLJugowicze 2980Stowarzyszenie JUG Łódź
The Boston Java Meetup Group CambridgeUSJava Developers 2963Kaj Kandler
Android254 NairobiKEdroiders 2938Priest Tamre
GDG Dallas DallasUSGDG Dallas members 2912Luke Wallace
Toronto Java Users Group TorontoCAMembers 2909Adib Saikali
Warszawa Java User Group (Warszawa JUG) WarsawPLWJUGowicze 2873Tomasz Szymanski
Moscow Big Systems/Big Data MoscowRUMassive Scale Developers 2858Alexey Ragozin
SoCal Node.js Los AngelesUSNoders 2851David
Polish Java User Group KrakówPLMembers 2847Konrad Malawski
Chicago Java Users Group ChicagoUSJava Enthusiasts 2847Janine Patterson
life michael tel aviv Tel Aviv-YafoILMembers 2846Haim Michael
Geeknight Coimbatore CoimbatoreINMembers 2843Selvakumar Natesan
Serverless San FranciscoUSMembers 2759Serverless User Group
3Pillar Product Innovation Group NoidaINProduct Innovators 2743Kapil Dhiman
Android Nigeria Community LagosNGMembers 2726Peter Ekene Eze
Atlanta Java Users Group AtlantaUSDevelopers 2719Vincent Mayers
Women Who Code Bangalore BangaloreINCoders 2716Women Who Code
London Dev Community LondonGBDeveloper, Manager, Architect 2701David Gimelle
Java User Group Argentina Buenos AiresARJavitos 2694Ramiro Rinaudo
Philippine Android Developers Community ManilaPHDroids 2682Evan Dale Aromin
Bay Area Mobile Mountain ViewUSBammers 2661A. Burkett
JAVA Colombo ColomboLKMembers 2643WSO2
Jozi-JUG JohannesburgZAJVM Developers with Passion 2641Michael Williams
Ch'ti JUG LilleFRCh'ti juggers 2629Team Ch'ti JUG
GDG Baghdad BaghdadIQMembers 2618gdg baghdad
DC Droids - DC Android Developers, Designers, Enthusiast WashingtonUSAndroid Fans 2598Gowri
Bristech BristolGBBristechnologists 2584Nicholas Hemley
London Code Skill Buddy - Learn Coding Get a Tech Job LondonGBMembers 2542Raj
Wroclaw JUG Meetup WroclawPLDevelopers 2540Mateusz Glapinski
Women Who Code LA Culver CityUSCoders 2536Women Who Code
DCJUG/Data Driven DC RestonUSMembers 2520Gray Herter
Tech Next PuneINTech Enthusiasts 2515Mukund Rajamannar
Duchess France Meetup ParisFRDuchess 2499Duchess France
GDG Jalandhar JalandharINCommunity Member 2486Nitika Rajput
MATH View Algorithm Design (MATHVAD) Palo AltoUSAlglorist Coders 2473Suresh B Velagapudi
Poland CodiLime Tech Talk WarsawPLLimes 2458CodiLime
Developing with Data in San Francisco San FranciscoUSDevelopers 2448Scott Mitchell
MadridJUG MadridESjuggers 2427Carlos Sierra
Women Who Code Manila ManilaPHAwesome Women Coders 2412Women Who Code
Carbon Five LA Hack Nights Santa MonicaUSHackers 2386Carbon Five
The Ahmedabad Java Meetup Group AhmedabadINCronies 2376Amit Raj Tyagi
Scala at the Sea SeattleUSMembers 2362Nick Elsberry
Paris Cassandra Meetup - by DataStax ParisFRCassandra Heroes 2358DataStax
Montréal JUG MontréalCAMembers 2358Montreal JUG
Skyway Software Symposium MinneapolisUStech folk 2348Kevin Behrens
Ciklum Ukraine/Belarus knowledge sharing community KyivUAIT geeks 2347Julia
Melbourne Java & JVM Users Group MelbourneAU0xCAFEBABEs 2346Kon Soulianidis
Today Software Magazine Cluj-NapocaROdevelopers 2339Ovidiu Matan
Perú Java User Group LimaPEMembers 2333Eddú Meléndez
it.roche.pl WarsawPLIT Professionals 2329Lukasz H
TLV - Android Academy Tel Aviv-YafoILAndroiders 2322Yonatan Levin
Amsterdam Java User Group AmsterdamNLAmsterdam JUGers 2315Vladimir Dejanović
Women Who Code Chicago ChicagoUSCoders 2307Women Who Code
Android Meetup Bogotá BogotáCODesarrolladores Android 2306Santiago Carrillo
Azure Israel Tel Aviv-YafoILMembers 2293Israeli Azure
Java Usergroup Berlin-Brandenburg BerlinDEJavaianer 2262Joerg M.
ThinkJava Kharkiv KharkivUAУчастники 2247NIX Solutions ltd
javaBin Oslo OsloNOMembers 2232Dervis M
GOTO Nights Chicago ChicagoUSGOTO'ers 2231Bianca Legorreta
GDG Cochin KochiINGDG Dev Member 2229Ninto Anto
Realm San FranciscoUSDevelopers 2218Morgan Contreras
Madison Area Software Developers Meetup Group MadisonUSSoftware Developers 2195Paul Miller
Pune Spring Developers PuneINSpringDevs 2187Imteyaz Ahmad
Denver Open Source Users Group DenverUSMembers 2186Mike Barker
ExpertTalks Portugal LisbonPTExperts 2185Nuno Marques
DevTalk LA Los AngelesUSMembers 2161Ken Dempster
OWASP Northern Virginia Chapter RestonUSMembers 2161OWASP Foundation
Guadalajara Java User Group ZapopanMXJava Programmers 2155Christian Gomez
DataKRK (formerly Cracow Hadoop User Group) KrakówPLMembers 2153Przemek Maciolek
Warsaw Data Tech Talks (Poland) WarsawPLWarsawDataTT members 2130Adam Kawa
Utrecht Java User Group UtrechtNLUtrecht JUGers 2119Thodoris Bais
Tech Talent South - Columbus ColumbusUSTech Tribe Members 2096Tech Talent South
GeoDev Meetup Group - Northeast ArlingtonUSMembers 2082Amy Niessen
The Iron Yard - Charleston CharlestonUSMembers 2081Tom Wilson
GDG Oslo OsloNOMembers 2074Thomas Bassetto
Java Vienna ViennaATMembers 2073Dominik Dorn
EPAM IT Events St. PetersburgRUMembers 2073Polina Panyukova
St. Louis Java User's Group Saint LouisUSMembers 2065Bruce Alspaugh
Singapore Spring User Group SingaporeSGSpring Developers 2063Sergiu Bodiu
DomCode UtrechtNLCoders 2037Lucas van Lierop
Detroit Java User Group DetroitUSJUG Members 2026Matt Schuetze
Minnesota Azure User Group MinneapolisUSAzure Users 2002Tim Plas
Serverless Turkey IstanbulTRMembers 1996Serverless User Group
Austin Developer Community AustinUSProgrammers & Developers 1993None
Tech@Agoda BangkokTHAgodians 1983Leonid Olevsky
Algorithms and Data Structures New YorkUSDevelopers 1981Alexey Potapov
Trójmiasto Java User Group GdanskPLJava Geeks 1976Kuba Marchwicki
Learning Android Development San FranciscoUSMembers 1970Nathan Esquenazi
GDG Rabat RabatMADevelopers 1967gdg rabat
Greetings, SVBBDev - BlackBerry App Developers! Santa ClaraUSSVBBDev - BB App Developers 1939Ping Bartley
WroclawIT WroclawPLMembers 1932Patka
Clean Code Alliance Tel Aviv-YafoILClean Coders 1911Itzik Saban
Tech Talks Israel Tel Aviv-YafoILMembers 1907Daniel Schwartzer
Bash! BelfastGBMembers 1906Tara Simpson
GDG Floripa FlorianópolisBRMembers 1896Fernanda Rabello
Tech Talks at Meetup New YorkUSTech Talks @ Meetup 1895Evan Estola
Spring Meetup Paris ParisFRSpring Aficionado 1895Florent Biville
Cleveland #learntocode Group ClevelandUStechies 1891Tech Elevator
GDG Lille LilleFRMembres 1885Fanny Demey
Android Devs Buenos Aires Buenos AiresARDesarrolladores 1880Julián Ezequiel Picó
SouJava São PauloBRMembros 1877Paula Macedo
Graph Database - San Francisco San FranciscoUSGraphistas 1857Neo4j
Silicon Valley Cloud Foundry User Group Palo AltoUSCloud Founders 1853Dave Nielsen
SoundCloud Tech Meetups - Berlin BerlinDEpeople 1850Vincent Garrigues
Austin Software Engineers & App Developers AustinUSSoftware Engineers/Developers 1846Chris Requena
Medellín Android MedellínCODroids 1845Carlos Daniel
Seattle Java User's Group (http://www.seajug.org) SeattleUSMembers 1836Nimret Sandhu