Two minors were also detained. They were later released after warning, police said.
Kavi Nagar police station SHO Ashok Sisodia said the raid was conducted following a complaint.
The complainant said his son was frequently skipping school and was one day found in the hookah bar, along with his friends.
Police said the arrested were Anurag Sinha, Deepak, Shivam and Ravi, who were running the hookah bar.
"We will ensure closure of the hookah parlour," the SHO said.