The total number of episodes in the entire original Avatar: The Last Airbender series is 61.
The series ran for three seasons, called Books: Water, Earth, and Fire. Together, those Books contain 61 chapters, or episodes, following Aang and his friends as they try to end the Fire Nation’s war.
The first episode aired on February 21, 2005, and the series concluded on July 19, 2008. Its finale, “Sozin’s Comet,” was presented as a four-part story and broadcast as a two-hour television event, but the installments are counted as four separate episodes.
A common mix-up comes from counting specials, recap programs, or short promotional productions alongside the main series. Those extras are not part of the 61-episode television run. The sequel, The Legend of Korra, is also separate and adds 52 episodes, bringing the two main animated series together to 113 episodes.