Presidential yacht may refer to a naval vessel of a country's navy that would be specially used by the country's president. It is common for a vessel to be designated as the presidential yacht during a fleet review.
Some countries (below) have vessels permanently designated as presidential yachts:
The President of Egypt has the 8th largest yacht, El Mahrousa, as his presidential yacht.
The President of Finland has a small private yacht, Kultaranta VIII.
The INS Sumitra is the presidential yacht of India.
The Italian ship Argo (MEN209) is the presidential yacht of Italy.
The BRP Ang Pangulo (English: BRP The President) is the presidential yacht of the President of the Philippines
Sirius was the yacht of Russian President Dmitri Medvedev
In the past, the United States employed presidential yachts serving the American president:
The most famous is "Galeb", the yacht of Marshal Josip Broz Tito.