Diyan Donchev (; born 8 January 1974 in Varna) is a former Bulgarian footballer. As a player, he was a defender and midfielder from 1992 to 2012. He was capped once for the Bulgarian team in 1999.
Donchev started his career in 1992 at Spartak Varna. In 1992 he was loaned to Cherno More. On 13 July 2000 he was transferred to the Greek side AEK Athens for a fee of 200 million drachmas. He failed to establish in the club of Athens and on 19 January 2001 his contract was terminated, which resulted in his return to Spartak Varna. Afterwards he moved to Lokomotiv Sofia for a short period before retirning to Spartak in 2002. He continuted his career with another spell at Cherno More and Lokomotiv Sofia. In 2008 he signed for Sportist Svoge for a season and then for Dorostol Silistra for another. He finished his career at Spartak Varna in 2012.
In March 1999 the Bulgarian national coach Dimitar Dimitrov called Donchev in Bulgaria national football team for friendly match against Ukraine. Diyan made his debut, but the result of the match was a 0âÂÂ1 loss for Bulgaria.