Penumarti Viswanatha Sastry (Telugu: పెనుమర్తి విశ్వనాథశాస్త్రి) (2 May 1929 – 25 December 1998), also known as "Ajanta", was a Telugu writer and editor.^[1]

He was born in Kesanakurru village in West Godavari district. After primary education at Narsapuram, he graduated and worked in different magazines in Hyderabad and Chennai.^{[citation needed]} He has worked as Chief Sub-editor of Andhra Prabha daily magazine in Vijayawada. He followed in the line of Srirangam Srinivasa Rao.^{[citation needed]}

He won the Sahitya Akademi Award for his Telugu-language poetic work "Swapna Lipi" in 1997.^{[citation needed]}