"This preliminary squad of 30 represents the best Twenty20 players in New Zealand," national selection manager Kim Littlejohn said. "It's a well-balanced squad with a number of proven performers, giving us plenty of options ahead of final squad selection.
"With the exception of George Worker and Anaru Kitchen, who have both shown promise at domestic level, each member has international experience.
"From this large group we believe we can select a talented Twenty20 squad that will make a strong claim in Sri Lanka."
New Zealand Twenty20 preliminary squad for the Twenty20 World Cup in Sri Lanka in September and October: Ross Taylor (c - Central Districts), Michael Bates (Auckland), Trent Boult (Northern Districts), Doug Bracewell (Central Districts), Broom (Otago), Dean Brownlie (Canterbury), Colin de Grandhomme (Auckland), Andrew Ellis (Canterbury), Daniel Flynn (Northern Districts), James Franklin (Wellington), Martin Guptill (Auckland), Roneel Hira (Auckland), Anaru Kitchen (Auckland), Tom Latham (Canterbury), Brendon McCullum (Otago), Nathan McCullum (Otago), Peter McGlashan (Northern Districts), Andy McKay (Wellington), Kyle Mills (Auckland), Adam Milne (Central Districts), Tarun Nethula (Central Districts), Rob Nicol (Canterbury), Jacob Oram (Central Districts), Tim Southee (Northern Districts), Daniel Vettori (Northern Districts), Neil Wagner (Otago), BJ Watling (Northern Districts), Kane Williamson (Northern Districts), Luke Woodcock (Wellington), George Worker (Canterbury).