O-Block is an neighbourhood in Mandaveli, Chennai south, Chennai, Chennai District, Tamil Nadu, India. Mandaveli (0.0 Km), Abiramapuram (1.3 Km), Raja Annamalai Puram (1.45 Km), Mylapore (1.68 Km), Foreshore Estate (2.21 Km) are the nearby areas to O-Block. Poombukar Nagar, Chennai are the nearby cities to O-Block.