The Oddworld Quintology consists of the entire Oddworld series which includes five Oddysees. Currently, there has only been two "proper" chapters with Abe's Oddysee and Munch's Oddysee; Abe's Exoddus and Stranger's Wrath are considered bonus games and do not count towards the Quintology, instead acting as companions to the series.
The Quintology consists of five Oddysees. Below is a list of the known Oddysees.
Squeek's Oddysee is believed to be the third part of the Quintology but has yet to be announced in any formal capacity.