Sant Singh Maskeen (1934–2005) was a prominent Sikh scholar and theologian known for his expertise of Gurmat and Gurbani.

He was honoured with the rare title of "Panth Rattan" for his services to mankind by the Shiromani Gurdwara Parbandhak Committee.

Maskeen ji was born in 1934 at Lakki Marwat (now in Pakistan) to father Kartar Singh and mother Ram Kaur.

He was given the title of Panth Ratan, the highest honor awarded by one of the Takhts to an individual for their exceptional services to the Sikh cause and mankind through the message of Gurbani.

Maskeen ji died on 18 February 2005 due to a heart attack while attending a marriage in Etawah, Uttar Pradesh, India.