Giovanni Battista Cassevari (4 March 1789 – 11 June 1876) was an Italian painter in the neoclassical style.
As a boy, he attended the Academy of Fine Arts in Florence and studied under Pietro Benvenuti.
In Rome, he befriended leaders of the Neoclassical trends: Camuccini, Thordwalsen, Tenerani, d'Azeglio, Monti, Bassi, and Missirini.
The portraits in oil afterwards executed by him there and later in England are painted in the style of the Italian and Dutch masters.
An engraving depicting Maria Teresa, Queen of Sardinia, is found in the Royal Collections of England.