In the United States the title is Secretary. Robert Michael Gates has been the U.S. Secretary of Defense since December of 2006, when he was sworn in under President George W. Bush.
The United States Department of Defense is part of the executive branch of the United States government. The head of the Department of Defense is the Secretary of Defense, who is a member of the President's cabinet. Other countries have their own equivalents, which are usually presided over by a Minister of Defense.
The president
Angel Naydenov is the Minister of Defense for Bulgaria.
Mark Owen Woyongo is the Minister of Defense for Ghana.
Chandigarh is a city. It will not have a defense minister of its own. The defense minister of India would be responsible for the defense of the entire country, including Chandigarh.
At the current time, March 2013, Alan Shatter is responsible for defence, coming under his department which is the department of Justice, Equality and Defence.
Roberta Pinotti is the Minister of Defense for Italy.
Ante Kotromanovic is the Minister of Defense for Croatia.
Samir Moqbil is the Minister of Defense for Lebanon.
Yuriy Zhadobin is the Minister of Defense for Belarus.
Christoforos Fokaidis is the Minister of Defense for Cyprus.
Sven Mikser is the Minister of Defense for Estonia.