Fonseca is a common Portuguese surname. It may refer to:

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People

• Fonseca, Colombian singer
• Adriana Fonseca, Mexican actress
• Alonso III Fonseca (1475 - 1534), Spanish archbishop and politician.
• Bruno Fonseca (1958-1994), United States artist
• Carlos Fonseca Amador, Nicaraguan founder of the Sandinistas
• Carlos Fonseca, Brazilian boxer
• Carolyn De Fonseca, United States actress
• Daniel Fonseca, Uruguayan football player
• Danny Fonseca, Costa Rican football player
• David Fonseca, Portuguese singer
• Deodoro da Fonseca, first President of the Republic of Brazil
• Francisco Fonseca, Mexican football player
• Fumilay Fonseca, São Toméan race walker
• Hermes Rodrigues da Fonseca, President of Brazil
• Isaac Aboab da Fonseca (1605-1693), rabbi, scholar, kabbalist and writer.
• Lyndsy Fonseca, United States actress
• Peter Fonseca, Canadian politician
• Rolando Fonseca, Costa Rican football player

Other

• Fonseca (cigar brand), two brands of Cuban and Dominican cigars
• Fonseca (port), brand of Portuguese port wine
• Fonseca (Niterói), neighborhood of Niteroi in Brazil
• Fonseca, La Guajira, town and municipality in Colombia.
• Gulf of Fonseca, gulf in Central America