The incident is said to have occurred on Ringwood Road, near Binstead Road, at around 18:45.
According to the teen’s family, a black Mercedes Vito van stopped as it was driving by and 2 men jumped out. The passenger in the van assaulted the teenager by punching him whilst the second man stole the victim’s orange mountain bike.
The assailants placed the bike in the back of their van and drove off.
The incident occurred whilst the 16-year-old was returning home to the Birch Gardens area of Binstead Lodge Road.
A spokesperson for Hampshire Constabulary has said:
“We received a report at 7.14pm about the assault of a teenage boy and the theft of a bicycle on Ringwood Road / Binstead Lodge Road.
“If anyone has any information about this incident, they should call 101″.
Anyone with information relating to this incident, including the whereabouts of the bike, is asked to contact Police on 101, quoting 44190377461.