Parameswara Iyer (18 June 1877 – 15 June 1949), born Sambasivan but popularly known as Ulloor, was an Indian poet of Malayalam literature and a historian.
He was one of the modern triumvirate poets of Kerala in the first half of the 20th century, along with Kumaran Asan and Vallathol Narayana Menon.
Umakeralam, a mahakavya, and Kerala Sahitya Charithram, a comprehensive history of Malayalam language, are two of his works.