This picture shows Chris Evans (Captain America) making fun of how much shorter Robert Downey Jr. (Iron Man) is so much shorter than the rest of the Avengers cast.
If we are going to look at specifics, RDJ is not the shortest of the case, that would be Scarlett Johansson (Black Widow). He is not even the second shortest, who is Mark Ruffalo (The Hulk). He isn’t far away from the rest of the cast.
From shortest to tallest, below.
Jeremy Renner (Hawkeye): 5′10
Chris Evans: 6′0
Tom Hiddleston (Loki): 6′2
Chris Hemsworth (Thor): 6′3
So why isn’t our fandom obsessing over Marks height? So go and get him 12% of a step stool because in these pictures He is shown next to Loki, the second tallest cast member, and Captain America, Third tallest.: