Blas Parera (1777 – 1840) was a Spanish music composer. He lived his part of his life in Buenos Aires.
He was born in Catalunya, Spain and, in 1797, he moved to Buenos Aires. He contributed in the defence of the port of Buenos Aires during the British invasions of the Río de la Plata. He composed the music of the Argentine National Anthem, written by Vicente López y Planes in 1813; it was known as the Marcha Patriotica. He went back to Spain briefly after, and died in Mataró on 7 January 1840.
He was also a music teacher.