Heloísa Maria Buarque de Hollanda (30 November 1937 – 27 December 2018), whose artistic name is Miúcha, was a Brazilian singer and composer.

She was the sister of Chico Buarque, Miucha, Cristina Buarque and Piii, and became the second wife of João Gilberto in April 1965. She was also the mother of Bebel Gilberto.