Adrian Claudiu Sînă (born April 18, 1977), better known as Adrian Sina or simply Adi Sina is a Romanian singer-songwriter, record producer, radio DJ and entertainer. He is best known for creating, producing and singing in the dance group Akcent and also for writing and producing mainstream hit songs for himself and other international artists. He started out as a disc jockey in the 1990s and then created a group with his fellow musician Ramona Barta. He came to prominence as a member of Akcent with the song "Ultima varǎ" (The Last Summer) in 1999. His group was joined by Marius Nedelcu, Sorin Brotnei and Mihai Gruia. Together they scored multiple number-one hits both in Romania and throughout Eastern Europe, especially in the mid-2000s. Their albums have been certified multi-Platinum by the Uniunea Naţională a Producătorilor de Fonograme din România and were sold in millions of copies worldwide. Their signature song was "Kylie", released in 2005.

In the early 2010s, Sina decided to release himself in a solo career and co-opted various recording artists on his side. He started his own record label, Premium Artist (formerly known as Sisterhoodlive Records) and he recorded some solo hits, such as "Hold On", "I Can't Live Without You" or "Angel". In 2011 he was also on the judging panel of the Romanian X Factor where he coached the over 25s. In the meantime, he managed to produce and write several number-one and top-ten hits for up-and-rising artists such as boyband Maxim and songstress Lidia Buble. He released a single, entitled "Arde ceva" (Something Burning) which was released in 2013. Songs "Lacrimi curg" and "Tu m-ai dat gata" followed, and his latest release is a collaboration with Cojo, namely "Zile bune, zile rele".