All the matches of the League, in which six teams are participating, will be held at the iconic Wankhede Stadium.
The announcement to appoint Gavaskar was made by the Mumbai Cricket Association (MCA) and Probability Sports India Private Limited (PSIPL) through a media release.
Gavaskar was the first Test batsman to score 10,000 runs.
"The T20 Mumbai League is a very exciting development in the city's cricketing landscape, and it is thrilling to be a part of it from the inaugural edition itself.