The collision involved a black Kawasaki ZL600 motorbike on Heightington Road in Bewdley.
Police believe the motorcyclist lost control of the bike, for reasons unknown at this time. He died at the scene.
A spokesman for West Mercia Police said: "We are appealing for information following a collision that took place on Heightington Road, Bewdley. The incident took place at 2.50pm on Friday, August 13.
"The collision involved a black Kawasaki ZL600 motorbike, which for unknown reasons at this time lost control. Sadly, the motorcyclist died at the scene of the incident.
"We are especially interested in speaking with the occupants of a dark coloured vehicle and a red coloured vehicle which were seen driving along Heightington Road around the time of the collision and who may be able to assist with our investigation."
Anyone with information, or any dash-cam footage of the incident, should call PC Rebecca Jansen on 07773 042526 quoting incident number 382i of August 13.