The young generation should take inspiration from his life, he said.
He said that Dr Mangal Sen was vigilant sentinel of Hinduism, Nationalism and Indian Culture.
"He was a dedicated social worker who worked selflessly throughout his life. He played active role in every social and national problems, be it Hindi Movement or Kashmir issue, protection of rights of Haryana and during the attacks by Pakistan and China," Khattar said.
The Chief Minister paid floral tributes to Mangal Sen on the occasion of his 89th birth anniversary, at Haryana Civil Secretariat here.
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Sen had remained deputy chief minister of Haryana from 1977 to 1979. He got in state legislative from Rohtak assembly seat on seven occasions.
Khattar said that he himself had a chance to work with him and learned a lot.
The Chief Minister also greeted the people of the state on the occasion of Maharshi Valmiki Jayanti and urged them to follow the path shown by Maharshi.
He said that Valmiki did not belong to a particular sect, but was the epitome of entire humanity.
The CM said that a number of welfare schemes had been started during the past one year, which have been yielding positive results.
On new schemes of government on the occasion of completion of 50 years of Haryana's inception, he said that it is a matter of happiness that Haryana is entering 50th year of its inception on November 1 and would celebrate golden jubilee in 2016.