Galleons	GAL yunz
George	jorj
Gilderoy	GILD roy
Ginny	JIN ee
Gobbledegook	GOB ul dee gook
Goyle	GOY ul
Granger	GRAIN jer
Grimmauld	GRIM-old
Grindylow	GRIN dee lo
Gringotts	GRIN gots
Griphook	GRIP hook
Gryffindor	GRIF in dor

 

 

 

The English to American Dictionary (I found this to be the funniest guide!)
Dictionary of English Slang and Colloquialisms of the UK
American/British Dictionary
British to Canadian Vocabulary Guide (you need Acrobat Reader for this)
Other Links