Lacunza is a surname. Notable people with the surname include:
Benita Galeana Lacunza (1903–1995), Mexican writer, suffragist, unionist, and activist Hernán Lacunza (born 1969), Argentine economist Izaskun Lacunza, Spanish scientist José Luis Lacunza Maestrojuán (born 1944), Spanish-born Panamanian Catholic bishop Leandro Lacunza (born 1997), Argentine footballer Manuel Lacunza (1731–c. 1801), Chilean Jesuit priest María Lacunza Ezcurra (1900–1984), Spanish lawyer and politician Natalia Lacunza (born 1999), Spanish singer-songwriter