The Monkey Island series first game was The Secret of Monkey Island released on 1st October 1990.
1990
The Secret of Monkey Island
1st October 1990
1991
31st December 1991
1992
12th September 1992
Monkey Island 2: LeChuck's Revenge
31st December 1992
2001
Escape from Monkey Island
18th June 2001
2009
Tales of Monkey Island
27th July 2009
2010
The Secret of Monkey Island: Special Edition
22nd April 2010
15th June 2010
Monkey Island 2 Special Edition: LeChuck's Revenge
6th July 2010