Wiltshire Police is appealing for witnesses following a road traffic collision on the A4361 near Wroughton.
The incident happened at around 4pm on Sunday 19 June 2016, at the crossroads for Salthrop and Uffcott.
The collision involved a red Yamaha motorcycle and two cars, a grey Volkswagen and a yellow Nissan. The motorcyclist, a 24 year old male from Swindon, was airlifted to Southmead Hospital in Bristol. There were no other injuries.
PC Jasmin Windsor said: “We closed the road for around five hours while we carried out investigation work.
“This is the main road between Swindon and Devizes, and I’m interested in speaking with anyone who was in the area at the time that may have witnessed the incident.”
Anyone with any information is asked to call PC Windsor on 101, or Crimestoppers, where information can be left anonymously, on 0800 555 111.