As you have asked about the address of the Hubli LPG regional office of the Hindustan Petroleum Corporation Limited, I am giving you information about it, check below for the details

Giriraj Kishore Patel,
Public Grievance Redressal Officer,
Hubli LPG RO

Hubli LPG Regional Office,
HPCL, 165/166 KIADB Indl. Area,
Belur, Dharwad, Karnataka, 580011
Office 10836)2486827
Office 20836)
Mob: 8496063777

Contact:

BANGALORE
HP GAS Customer Service Cell, HPCL, NO. 77,
Old Madras Road, Doorvaninagar post ,
Bangalore , Karnataka , Bangalore , 560016
080 30128601