Orlando furioso RV 819 (Italian pronunciation: [orˈlando fuˈrjoːzo, -so], Teatro San Angelo, Venice 1714) is a three-act opera surviving in manuscript in Antonio Vivaldi's personal library, only partly related to his better known Orlando furioso (RV 728) of 1727.

It is a recomposition of an Orlando furioso written by Giovanni Alberto Ristori which had been very successfully staged by Vivaldi and his father's impresa in 1713, and whose music survives in a few fragments retained in the score of RV 819.

[3][4] One suggestion is that Vivaldi avoided putting his own name on the opera having himself only recently taken direction of the Teatro San Angelo.

The French label Naïve, which had already recorded the more famous Orlando furioso and Orlando finto pazzo for its Vivaldi Edition, released a recording[6] of the July 20, 2012 première at the Festival de Beaune, with Sardelli conducting Modo Antiquo and singers including Riccardo Novaro as Orlando, Gaëlle Arquez as Angelica, Romina Basso as Alcina and Teodora Gheorghiu as Bradamante.

Given the heavily defective nature of the surviving manuscript, Sardelli had to reconstruct or compose ex novo the seven incomplete arias, in a Vivaldian style.