.mumbai was a rumored GeoTLD application to ICANN's new gTLD program. It was originally confirmed in June, 2011, as a joint venture of Minds + Machines and India TL Domain with official government support coming from the Deputy Mayor of IT at the Municipal Corporation of Greater Mumbai. That letter of support was revoked 2 months later by the Deputy Major, who cited that such official endorsements must come from the Municipal Commissioner.
Given Mumbai's status as the largest and richest city in India, many expected to see an application for .mumbai, but when rejecting M + M's authority it was requested that ICANN “not allocate any domain ending with .mumbai (dot Mumbai) to any party / organization / company”.
No application for .mumbai was submitted in the first round of ICANN's open gTLD expansion program.