Rattan Singh Jaggi (27 July 1927 – 22 May 2025) was an Indian scholar, author, literary critic and academic specialising in Punjabi, Hindi and Gurmat literature. He was known for his research, publications, and multi-volume commentaries on Sikh scriptures and related literature. He was awarded the Padma Shri, India's fourth highest civilian honour, in 2023 in the field of literature and education.

Rattan Singh Jaggi was born on 27 July 1927 in Pindigheb, District Campbellpur, British India (now in Punjab, Pakistan). Following the Partition of India, his family relocated to India. He pursued higher education, earning Master of Arts degrees in Punjabi (1955) and Hindi (1957). He later obtained a PhD in 1962 from Panjab University (Chandigarh) with a thesis on the Puranic compositions in the Dasam Granth. In 1973, he was awarded a D.Litt. degree by Magadh University, Bodh Gaya, for his research on Guru Nanak.

Jaggi began his academic career as a lecturer in a government college in 1957. In 1963, he joined Punjabi University, Patiala, where he taught in the Department of Punjabi. He eventually became Professor and Head of the Department of Punjabi Literary Studies and served as the Chief Editor of the university's literary magazine, 'Khoj Patrika'. He retired from Punjabi University in 1987. After his retirement, he remained associated with the university and continued his scholarly work.

He authored over 140 books on various aspects of Punjabi, Hindi, and Gurmat literature. His work is particularly noted for its depth in medieval literature and the Bhakti Movement.

Jaggi died after a brief illness in Chandigarh on 22 May 2025 at the age of 97.

Jaggi's notable contributions to literature include multi-volume encyclopedias and detailed commentaries on major religious texts.

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Jaggi also provided comprehensive commentaries and translations of important religious and literary works: