Giovanni Battista Bianchini (born after 1650 – died 26 September 1708) was an Italian organist, choir director, conductor, and composer of the Baroque period.
He served as maestro di cappella at the Orvieto Cathedral (1678–1684) and Rome's Archbasilica of Saint John Lateran (1684–1708).
He served simultaneously as first phonascus (a post akin to a choir director) and later "praefectus musicae" at the Oratorio of San Marcello (also known as the Oratory of Santissimo Crocifisso, an oratory connected to the San Marcello al Corso); beginning his work there in 1687.
He involved with opera performances in Orvieto in 1693 that were staged in celebration of Pentecost and Corpus Domini.
He also served as both organist and maestro di cappella at the San Salvatore in Lauro, Rome in 1694.