The final squad of 15 will be named in January.
The World Cup starts on February 14 and runs until March 29.
The Proteas will open their campaign against Zimbabwe at Seddon Park in Hamilton on February 15.
CWC preliminary
squad:
AB de Villiers (Titans, captain), Hashim Amla (Cape Cobras,
vice-captain), Kyle Abbott (Dolphins), Farhaan Behardien (Titans),
Quinton de Kock (Highveld Lions),
Marchant de Lange (Titans), JP Duminy (Cape Cobras), Faf du Plessis
(Titans), Dean Elgar (Titans), Beuran Hendricks (Cape Cobras), Reeza
Hendricks (Knights), Imran Tahir (Dolphins), Rory Kleinveldt (Cape
Cobras), Ryan Mclaren (Dolphins), David Miller (Dolphins), Morne Morkel
(Titans), Chris Morris (Highveld Lions), Justin Ontong (Cape Cobras),
Wayne Parnell (Warriors), Robin Peterson (Cape Cobras), Aaron Phangiso
(Highveld Lions), Vernon Philander (Cape Cobras), Andrew Puttick (Cape
Cobras), Kagiso Rabada (Highveld Lions), Rilee Rossouw (Knights),
Mthokozisi Shezi (Cape Cobras), Dale Steyn (Cape Cobras), Lonwabo
Tsotsobe (Highveld Lions), Morne van Wyk (Dolphins), David Wiese
(Titans)