Tranquillo Maria Laurentio Mollo (August 10, 1767 - March 29, 1837) was Vienna based Swiss/Italian graphic designer, printer, art and music dealer, and publisher active in the late 18th and early 20th centuries. From about 1792 Mollo worked with the Vienna firm Artaria and Company. In 1798 he separated from Artaria to found, along with partner Franz Bernardini, his own music, art, and map publishing company, T. Mollo and Co. The partner collapsed after one year and Mollo took a new partner, Domenico Artaria, a scion of the Artaria family. In 1802 Mollo and Domenico acquired Artaria and Company from Carlo Artaria. Domenico and Mollo parted ways in 1804, after which Mollo published independently. Under his own imprint, he became one of Austria's most important globe and map publishers. He collaborated extensively with English and French publishers to bring French material to his work. Among his more significant collaborators was the Vienna publisher Joseph Dirwaldt. In 1832 Mollo passed the company to his sons, Eduard (1799-1842) and Florian Mollo (1803-1869). The Mollo brothers ran the business until 1839, three years after Tranquillo Mollo's death, before dividing the concern into separate business.