The incident happened on Norwich Road on Wednesday (25 September) near the junction with Coopers Way at about 5.30pm.
The girl was approached by two men who got out of a dirty white van which pulled over near her on the side of the road.
They asked her if she wanted a lift and she declined. The men got back into the van which drove off down Benezet Street.
One man is decribed as white and in his early 20s, approximately 6’2” tall with short blonde hair spiked up and a Polish accent. He wore a grey hooded top and jeans.
The second man is also white and in his 20s, with short blonde hair and a dark blue jumper.
There is no description for a third man who was driving the van.
Anyone with information should call Pc Emma Allard from Ipswich on 101.
See on www.ipswichstar.co.uk