Tonka Ivanova Petrova (Bulgarian: ????? ???????? ???????) (born 1 February 1947, Yambol) is a Bulgarian middle-distance runner.She won a silver medal at European Indoor Championships in the 1500 metres run in Rotterdam in 1973.
In 1974, she won a gold medal at the European Indoor Championships' 1500 m run in Gothenburg and a silver medal in a 4 x 392 metres relay race with Bulgaria.
She also competed in the women's 1500 metres at the 1972 Summer Olympics.