Dr Sita Ram Lalas (known as Sita Ramji maadsaab) (December 29, 1909-)was a renowned linguist and lexicographer of India.
He produced a written dictionary of the local Rajasthani language- first ever in the language with name: Rajasthani sabada Kosa and Rajasthani Hindi brhat kosa.This perhaps is one of the biggest dictionaries of the world consisting of more than 2,00,000 words. The dictionary contained not only the meanings but the origin, synonyms, idioms and phrases based upon each word. It is named Rajasthani bhasha-sahitya evam vyakarana and was first published in 1962.The volume was acclaimed as a significant academic work by national and international scholars. The volume included two hundred thousand (2 lakh) words.
Dr Sita Ram Lalas devoted 40 years in the compilation of this outstanding work and was awarded Padma Shri in 1977 for his contribution. He was also awarded honourary doctorate by the then Jodhpur University. Dr Lalas was also known for his excellent knowledge of Ayurveda besides being remembered as a great teacher. Dr Sita Ram Lalas was from Charan community.