Antonio Pacinotti (Pisa, June 17, 1841 – Pisa, March 25, 1912) was an Italian physicist. To him we owe the invention of the dynamo. Born to Louis and Catherine Pacinotti Catanti, attended the institute in 1859 and archbishop St. Catherine took part in the War of Independence as a sergeant volunteer. He was a pupil of Carlo Matteucci, graduated in mathematics with Riccardo Felici and he obtained the chair of physics at Bologna, where he taught from 1865 to 1873. Among his pupils there was Righi. After an assignment in Cagliari, in 1881 became the University of Pisa, where he took over his father Louis in the chair of physical technology. The invention of the dynamo dates back to 1858, and the creation of the first model, made in the laboratory of his father, 1860. In 1883 he became a member of the Accademia dei Lincei and dentist, in 1898, national member. In 1888 he joined the Society of XXL, and in 1905 he was appointed Senator of the Kingdom of Italy. Pacinotti is dedicated to the name of the Scientific High School in La Spezia and Cagliari, the State Technical Institute for Surveyors of Bologna, Taranto and ITIS IPSIA Scafati and Pontedera.