Guptill's selection sees him join an exclusive list of players in Dwayne Bravo, Chris Gayle, Mohammad Mahmudullah and Mushfiqur Rahim in a list to play in seven tournaments - while Shakib Al-Hasan and Rohit Sharma are set for their eighth events.
Nathan McCullum and Ross Taylor are the only other New Zealanders to have appeared at six T20 World Cups.
Of those who featured in last year's World Cup squad, Kyle Jamieson wasn't considered as he continues his rehabilitation from a back injury, while Todd Astle and Tim Seifert have missed selection.
The squad will first contest the T20 Tri Series with Pakistan and Bangladesh starting in Christchurch on October 7 before they depart for Australia on October 15.
The Black Caps open their T20 World Cup campaign against Australia at the SCG on Saturday October 22, before facing Afghanistan (MCG), England (Gabba) and two qualifiers at the SCG and Adelaide Oval respectively.
Black Caps squad for ICC T20 World Cup and Tri Series
Kane Williamson (c)
Finn Allen
Trent Boult
Michael Bracewell
Mark Chapman
Devon Conway (wk)
Lockie Ferguson
Martin Guptill
Adam Milne
Daryl Mitchell
Jimmy Neesham
Glenn Phillips
Mitchell Santner
Ish Sodhi
Tim Southee