Adair missed the last series in Bangladesh due to a knee injury but has replaced Jordan Neill in the only change to that squad.
Stirling leads an experienced batting line-up that also features Harry Tector, Lorcan Tucker and Curtis Campher.
Josh Little, Barry McCarthy, Craig Young, Mark Adair will carry the fast-bowling attack with allrounder Campher also a seam option.
Ben White, Matthew Humphreys and Gareth Delany are the trio of spinners included with George Dockrell now playing primarily as a specialist batter.
Ireland start their T20 World Cup campaign against co-hosts Sri Lanka in Colombo, before taking on other group opponents Australia (February 11), Oman (February 14) and Zimbabwe (February 17).
Ireland T20 World Cup squad: Paul Stirling (captain), Mark Adair, Ross Adair, Ben Calitz, Curtis Campher, Gareth Delany, George Dockrell, Matthew Humphreys, Josh Little, Barry McCarthy, Harry Tector, Tim Tector, Lorcan Tucker (wk), Ben White, Craig Young
The Bangladesh Cricket Board (BCB) says the ICC "has conveyed its willingness to work closely" with the country due to security concerns about playing in India at the T20 World Cup.
New Zealand will set to rotate their fast bowlers at the upcoming T20 World Cup as Lockie Ferguson and Matt Henry may miss brief periods on paternity leave and recovering from injury.
Dale Steyn has questioned South Africa's decision to leave Ottneil Baartman out of their T20 World Cup squad, despite the pacer's outstanding form in the SA20.
Jason Smith says he will bring versatility to the Proteas batting order after being included in the squad for the T20 World Cup that will start on 7 February and will be co-hosted in India and Sri Lanka.
