Uthirakosamangai, also known as Mangalanatha Swamy temple, is a Shaiva temple situated near Ramanathapuram in the Ramanathapuram district of Tamil Nadu. The temple is much older and the structure as it exists today is believed to be built by the Pandya kings, Achutappa Nayak (1529–1542 CE), Muthuveerappar and other kings of Ramanthapuram at various times. The temple has been glorified by the hymns of 9th-century saint Manickavasagar and 15th-century saint Arunagirinathar.