My mind keeps returning to this. Now, I do realize that what constitutes "creation" isn't always cut and dried. If you were to assign OFFICIAL credit for Iron Man's creation, though, to whom would you give it? Stan Lee is obviously a co-creator, but who else?
Don Heck? I'd say "yes." He did design Tony Stark, Pepper Potts and Happy Hogan, and co-plotted the first story. However -
Heck didn't design the armor! That's a pretty important part of what makes Iron Man what he is. So... who else gets credit for creating Iron Man?
Jack Kirby? Here, I'm not so sure. He designed an armor that wasn't used beyond a few issues! He didn't design Tony Stark, and I haven't read anything to indicate that he had any input on the origin.
Steve Dikto? I'm not sure here, either. He designed the stream-lined red and gold armor, and every subsequent armor has been a variation of this design. Still...Ditko didn't design the FIRST armor! It wasn't his idea to give the character armor at all! Does he deserve co-creator credit? If yes, then... does EVERY artist who redesigns a super hero's costume get co-creator credit? Hmmm?
So, who, in your opinion, created Iron Man?
1. Lee and Heck.
2. Lee, Heck and Kirby
3. Lee, Heck and Ditko
or
4. Lee, Heck, Kirby and Ditko (all four)!
Me, I'd say "all four," but again, that does bring up other issues. For example, should the X-Men be credited as "Created by Lee, Kirby, Wein, Claremont, Cockrum and Byrne?"

"Your superior intellect is no match for our puny weapons."
-From
The Simpsons, "Treehouse of Horror II"