Zeller joins junior guard Victor Oladipo in announcing his decision to enter the draft after averaging 16.5 points and 8.0 rebounds this season for Indiana.
Zeller scored 1,157 points over 72 career games with the Hoosiers after helping them win the Big Ten regular-season title and advance to the East Region semifinals of the NCAA Tournament.
Carter-Williams, meanwhile, helped end the Hoosiers' season in that contest as a member of the Syracuse Orange.
The Massachusetts native started all 40 games Syracuse this season, averaging 11.9 points, 7.3 assists and 2.78 steals per contest.
He was a key part of a team that finished 30-10 overall to reach the Final Four before falling to eventual runner-up Michigan.