Here is a list of the main characters and the actors who portrayed them. See the Related Link below for a complete list of the cast and crew.
Dr. Alan Grant...Sam Neill
Dr. Ellie Sattler...Laura Dern
Dr. Ian Malcolm...Jeff Goldblum
John Hammond...Richard Attenborough
Robert Muldoon...Bob Peck
Donald Gennaro...Martin Ferrero
Tim Murphy...Joseph Mazzello
Alexis "Lex" Murphy...Ariana Richards
Ray Arnold...Samuel L. Jackson (yes, THAT Samuel L. Jackson)
Henry Wu...B.D. Wong (better known as Dr. George Huang on Law & Order: SVU, also guest starred on my all-time favorite show, The X-files)
Dennis Nedry...Wayne Knight (better known as Newman from Seinfeld)
The cast of Manly World - 1990 includes: Colin Quinn
The cast of The Fourth World - 2011 includes: Mark Volkers
The cast of Women of the World - 1998 includes: Lung Chan
The cast of Eyes of the World - 2003 includes: Slobodan Milosevic as himself
The cast of Small World - 2008 includes: Dan Wriggins as Dylan
The cast of What a World - 2015 includes: Kelly Pendygraft
The cast of Where in This World - 2008 includes: August Diehl
The cast of The World - 2014 includes: Jessica Preddy
The cast of Out of This World - 2014 includes: Mohammad Rizwan
The cast of The End of the World - 2003 includes: Fluid
The cast of Who in the World - 1962 includes: Warren Hull as Host
The cast of The War of the World - 2006 includes: Niall Ferguson
The cast of Sjaak the World - 2010 includes: Sjaak Lucassen
The cast of I Am a Visitor in Your World - 2013 includes: Rebecca Babcock
The cast of A World Not Ours - 2012 includes: Mahdi Fleifel
The cast of The World of Interiors - 2003 includes: Neil Conrich
The cast of The Rest of the World - 2008 includes: Cassandra Tribe