Great Britain had the largest navy in WW1.
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"The United States navy is known to be the largest in the world. Even if the next seventeen forces in the list were combined, they do not stand equivalent to the United States navy. The budget of the US navy for the fiscal year 2008 is around $127.3 billion. Around 335,000 personnel are on duty in the US navy and there are around 128,000 personnel in held Reserve. Currently, the US navy operates on 280 ships and 3,700 aircraftsEven the world's prime carrier fleet with eleven carriers in service and two under construction is possessed by United States Navy." http://www.navioline.com/united-states-navy-world's-largest-navy.html
Germany had a very powerful Navy during World War One, because their U-Boats (Submarines) were the most efficient and they were the first to make them. And so they had lots of U-Boats which gave them an advantage. Arguably Germany had the strongest Navy in both World Wars. (1 and 2)
britain
Bolivia has the largest navy of any landlocked country. Other landlocked countries with a separate Navy force include Uganda, Laos, Azerbaijan, and recently Serbia (since Montenegro split with them) and others.
The American Navy