A Twenty20 International (T20I) is an international cricket match between two teams, each having T20I status, as determined by the International Cricket Council, the sport's world governing body.^[1] In a T20I, the two teams play a single innings each, which is restricted to a maximum of 20 overs.^[2] The format was originally introduced by the England and Wales Cricket Board for the county cricket competition with the first matches contested on 13 June 2003 between the English counties in the Twenty20 Cup.^[3] The first T20I took place on 17 February 2005 when Australia defeated New Zealand by 44 runs at Eden Park in Auckland.^[4]

A century is a score of one hundred or more runs by a batsman in a single innings.^[5] This is regarded as a notable achievement.^[6] The first century in a T20I match was scored by Chris Gayle of the West Indies who made 117 against South Africa at the inaugural ICC World Twenty20 in 2007.^[7][8]

India's Rohit Sharma and Australia's Glenn Maxwell jointly lead the list with five T20I centuries each.^[9] In July 2018, Australia's Aaron Finch scored 172 from 76 balls against Zimbabwe to break his own record for the highest score in a T20I match,^[10][11] eclipsing the 156 he set in August 2013.^[12] Namibia's Jan Nicol Loftie-Eaton  holds the record for the fastest T20I century, reaching the milestone in 33 deliveries against Nepal during 2024 Nepal Tri-Nation T20I Series.^[13]

Four players have scored a century on their T20I debuts.^[14] The oldest player to score a T20I century is Gibraltar's Avinash Pai who was aged 39 years and 272 days when he reached 107 not out runs against Bulgaria in October 2021.^[15] At the age of 18 years and 280 days, Gustav Mckeon of France became the youngest, scoring 109 runs in July 2022 against Switzerland.^[16]

As of 21 April 2024^[update], 147 centuries have been scored by 110 different players.^[17] India lead the list with 17 centuries.^[18]