Satheesraj Srithirukumar (17 June 1984,Tellippalai, Jaffna District, Sri Lanka), better known as his stage name Kadhalviruz (Tamil: காதல்வைரஸ்), is a Tamil singer, rapper and record producer. His debut single Without you - En Uyir Kadhale, was released in 2008 which reached number one Worldwide.

Kadhalviruz is the founder of the record label Kadhalviruz-Music, established in 2012. Throughout his career as a singer, Kadhalviruz has extensively used the auto-tune pitch effect. As a rapper, he uses English and Tamil and sometimes mixes these two languages together.