Hello,

Following colleges in Mumbai offer PhD in Hindi;

Ramnarain Ruia College
BK Birla College of Arts Science and Commerce
Guru Nanak Khalsa College of Arts Science and Commerce
Kishinchand Chellaram College
Ramniranjan Jhunjhunwala College
K J Somaiya College of Arts and Commerce, Mumbai
Changu Kana Thakur Arts, Commerce and Science College, New Panvel
Siddharth College of Arts Science and Commerce, Mumbai
Maharshi Dayanand College of Arts Science and Commerce, Parel
Guru Nanak College of Arts, Science and Commerce, Mumbai

chech out our page at https://university.careers360.com/colleges/list-of-phd-in-hindi-degree-colleges-in-mumbai to know more details regarding this.