Councillor Bagha was first elected as a councillor in 1994 and became the 50th mayor of Ealing in 2014. He lived in the borough for more than 50 years.
Councillor Julian Bell, leader of the council said: "Tej was just a lovely man, a very humble man and a good friend who gave his time and experience generously. He served the residents of this borough and the wards he represented conscientiously and with real humanity on numerous committees and school governing bodies, as well as being a distinguished and worthy mayor of Ealing. Tej will be truly missed by all those who knew him and working alongside him.
"During his year as mayor he was supported by his daughter Harprit and daughter-in-law Manjit. I know that they, along with his son Prince and his grandchildren will be heartbroken at his passing and our thoughts are with them at this difficult time."
Details of the funeral will follow in due course.
Councillor Bagha's death will mean that by-election will take place for Dormers Wells ward in due course.