Tugba Koyuncu (née Karakaya; born February 16, 1991 in Kayseri, Turkey) is a Turkish female middle distance runner.
She is a student of physical education and sports at the local Erciyes University.
Karakaya was a member of the Fenerbahçe Athletics Club, where she was coached by Süleyman Altinok before she transferred to Enkaspor.
The 169 cm (5 ft 7 in) tall athlete weighs 55 kg (121 lb).She was born to Kasim Karakaya, a restaurant employee, and his wife Ikbal, who both have seven children.
She is the older of two sisters.
She began running at the age of 12.She won a silver medal in 1500 m event at the 2011 European Athletics U23 Championships in Ostrava, Czech Republic.
Koyuncu competed at the 1500 m event at the 2012 Summer Olympics where she failed to reach the semifinals.
At the 2013 Mediterranean Games in Mersin, Turkey, she took two bronze medals, one in the 800 m and the other in the 1500 m event.
At the 2013 Islamic Solidarity Games held in Palembang, Indonesia, Koyuncu won also a bronze medal in the 800 m event.