You Do Need power plug adapter while traveling from Greece to Iraq.

Here is Why You Need An Adapter

The outlet and plug type used in Iraq are C, D and G and in Greece are C and F. This is how they look like.

Greece

In Greece, outlets of type C and F are in use.

Type C

Type F

Iraq

In Iraq, outlets of type C, D and G are in use.

Type C

Type D

Type G