Pro-Kurdish protesters clashed with police outside the Wokefield Estate near Reading in Berkshire, where Turkish President Recep Tayyip Erdogan was scheduled to attend a business event on Sunday afternoon.
A teenager suffered head and back injuries in the violence, according to local reports.
Anti-Erdogan protesters threw bottles and also tried to break through the police lines to stop cars from entering.
The Turkish President started his three day visit to the United Kingdom by attending a lunch organised by the British Turkish Tatlidil forum, while later on this week he will be meeting Prime Minister Theresa May and Queen Elizabeth II.