Movies
The Marvel superhero adaptation held off competition from Ashton Kutcher comedy What Happens in Vegas, which makes its debut at two.
Family adventure Speed Racer and futuristic thriller Doomsday are the week's other new entries, landing at four and six respectively.
Elsewhere, Jessica Alba horror The Eye drops five places to ten and Patrick Dempsey comedy Made of Honour falls three to seven.
The top ten movies in full:
1. (1) Iron Man - £1,988,643
2. (-) What Happens in Vegas - £1,270,410
3. (2) Forgetting Sarah Marshall - £527,363
4. (-) Speed Racer - £364,200
5. (3) Nim's Island - £319,329
6. (-) Doomsday - £313,172
7. (4) Made Of Honour - £280,344
8. (7) In Bruges - £103,875
9. (6) 21 - £90,198
10. (5) The Eye - £89,538
Movie Reviews
'Extremely Loud & Incredibly Close' reviewTom Hanks features in a long and winding journey through New York after 9/11
At the Movies
Nicolas Cage viral: GIF snake attackGhost Rider: Spirit of Vengeance star Nicolas Cage demonstrates a snake attack.
Movies Interviews
Nicolas Cage 'Ghost Rider' interviewNicolas Cage on the Ghost Rider reboot, Con Air sequel and pet cobras...
Box Office Charts
'The Woman in Black' wins UK box officeThe Woman in Black beats The Muppets and Star Wars at the the UK box office.
