Giovanni Buonaventura Viviani (15 July 1638 Florence –about 1693 Pistoia) was an Italian composer and violinist.
Between 1672 and 1676 he was director of the court music at Innsbruck, which, after the extinction of the Tyrolean Habsburgs, had come under the control of the emperor.
As a composer Viviani is known mostly for his operas and solo cantatas which follow the style of Antonio Cesti.
His instrumental works are predominantly in the Italian style, though south German and Austrian influences are also recognizable.
The Solfeggiamenti, textless vocal pieces intended for teaching purposes, are unusual examples of this genre because of the number of their movements and their exceptional length.