Daniel Sargent Curtis (1825–1908) was an American lawyer and banker. He was a trustee of the Boston Public Library, director of the Boston National Bank and owner of Palazzi Barbaro, Venice.

The Palazzi Barbaro—also known as Palazzo Barbaro, Ca' Barbaro, and Palazzo Barbaro-Curtis—are a pair of adjoining palaces, in the San Marco district of Venice, northern Italy. They were formerly one of the homes of the patrician Barbaro family. The Palazzi are located on the Grand Canal of Venice, next to the Palazzo Cavalli-Franchetti and not far from the Ponte dell'Accademia. The buildings are also known as the Palazzo Barbaro-Curtis. It is one of the least altered of the Gothic palaces of Venice.