Hari Nama Keerthanam is a medieval devotional and philosophical text in Malayalam. Its title translates into English as "The Song of the Holy Name Hari." It was composed by Thunchaththu Ramanujan Ezhuthachan in Kerala around the 16th century. The work is historically important as it solidified the acceptance of the 51 letter version of the Malayalam alphabet owing to the song's immense popularity. The work is of great length and usually presented in book form. There are 66 original verses, to which a number of later verses and commentaries have been added, such as a section called the "Hari Narayanaya Nama," and the philosophical thoughts of the composer Ezhuthachan. P.R. Ramachander, in an introduction to his translation, notes of Ezhuthachan that:
From the book, it is clear that thunjathezhuthachan was a Vaishnavite who was fondly in love with the Advaitha philosophy. He mentions that his Guru was one Neelakanta Somayaji in one of the verses.