Ghai, who has helmed films like "Khalnayak", "Taal", "Ram Lakhan" and "Saudagar", has been in the industry for over four decades.
While Anupam thanked Ghai for his "guidance", Vivek Agnihotri wished the "Taal" helmer saying he has entertained Agnihotri "like hell".
Here is what the celebrities had to say:
Shabana Azmi: Happy birthday Subhash Ghai. Have a super year and a lovely birthday.
Vivek Agnihotri: Dear Subhash Ghai, I never wish on SM but happy birthday to you because you have entertained me like hell and I owe it to you. Keep shining.
Rakesh Roshan: Subhash ji Happy Birthday and God bless.
Anupam Kher: Happy birthday. Thank you for your cinema and guidance. Both helped me in shaping up my life. Have a long and happy life.
Anil Kapoor: Happy Birthday to the man who made cinema a grand experience for both actors and audiences. The master entertainer Subhash Ghai.