Harbhajan Singh (ਹਰਭਜਨ ਸਿੰਘ, born: 3 July, 1980 in Jalandhar, Punjab, India) is an Indian cricketer and is one of the world's most successful off spin bowlers.

Harbhajan made his Test and One Day International (ODI) debuts in early 1998. His career was initially beset by investigations into the legality of his bowling action and disciplinary incidents that raised the ire of cricket authorities. However in 2001, with leading leg spinner Anil Kumble injured, Harbhajan's career was resuscitated after Indian captain Sourav Ganguly called for his inclusion in the Border-Gavaskar Trophy team. In that series victory over Australia, Harbhajan established himself as the team's leading spinner by taking 32 wickets and becoming the first Indian bowler to take a hat trick in Test cricket.

A finger injury in mid 2003 sidelined him for much of the following year, allowing Kumble to regain his position as the first choice spinner. Harbhajan reclaimed a regular position in the team upon his return in late 2004, but often found himself watching from the sidelines in Test matches outside the Indian subcontinent with typically only one spinner, Kumble, being used. Despite unremarkable Test performances in 2006, which led to speculation about his lack of loop and his waning value as a strike bowler, he remains India's first-choice ODI spinner.

Harbhajan Singh (18 August 1920 – 21 October 2002) was a Punjabi poet, critic, cultural commentator, and translator. Along with Amrita Pritam, Harbhajan is credited with revolutionizing the Punjabi poetry writing style. He has written 17 collections of poems, including Registan Vich Lakarhara, 19 works of literary history and translated 14 pieces of literature of others including those of Aristotle, Sophocles, Rabindranath Tagore and selections from the Rig Veda.