Is India part of the commonwealth?

YES!!! India is part of the British Commonwealth.

Other large nations that are members of the British Commonwealth are Republic of South Africa.( formerly Union of South Africa), Australia, New Zealand , Canada. There are many smaller nations that are members of the British Commonwealth, and The U.K. still still has a few very small colonies.

One nation is a late entrant intyo the British Commonwealth, but was formrtly a Portugese Colony, it is 'Mozambique'.

Two notable nations that are NOT members of the British Commonwealth, but are English speaking as the official language are the U.S.A. and the Republic of Ireland.