The pair announced their intention on Friday afternoon in Tuscaloosa alongside coach Nick Saban.
Notably absent from the group was junior defensive lineman Jonathan Allen, whom ESPN NFL draft analyst Mel Kiper Jr. has as the fifth-best draft-eligible defensive end. Allen led the team with 12 sacks. The deadline for underclassmen to declare for the draft is Monday.
Henry won the Heisman Trophy after setting SEC records for rushing yards and rushing touchdowns in a single season. Kiper has Henry as the No. 2 running back available in the draft.
Robinson, an All-American, is the No. 2-rated defensive tackle in the draft, according to Kiper. Robinson had 7.5 tackles for loss and 3.5 sacks.