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Giovanni Lonfernini (born 2 October 1976) was captain regent of San Marino for the semester from October 2003 to March 2004. He is of the Sammarinese Christian Democratic Party, and his co-captain-regent was Valeria Ciavatta.
Lonfernini was the second captain regent of this name, the previous one having served in 1934, 1937, and 1941; see List of Captains Regent of San Marino.