Happy Child High School (HCHS) is a co-educational institution situated in Rehabari, Guwahati (Assam).

Nirmal Aggarwal started her career as Headmistress of Tarun Ram Phukan School, Guwahati.

During her tenure as the Headmistress of Shishu Niketan, she had a strong inclination to start her own school and usher the holistic development to the students of the society.

In this noble venture of hers, special mention can be made of her husband, Mr. M. P. Aggarwal, and their children, who stood by her through thick and thin and extended their whole hearted support and encouragement.

When it got affiliated in the year 1988, it changed its name to Happy Child High School.