Grigoraș Ionică Dinicu (Romanian: [ɡriɡoˈraʃ i.oˈnikə diˈniku]; April 3, 1889 – March 28, 1949) was a Romanian violin virtuoso and composer. He is most famous for his often-played virtuoso violin showpiece "Hora staccato" (1906) and for making popular the tune Ciocârlia, composed by his grandfather Angheluș Dinicu for "nai" (the Romanian pan flute). It is rumored that Jascha Heifetz once said that Grigoraș Dinicu was the greatest violinist he had ever heard. In the 1930s he was involved in the political movement of the Romanian Roma and was made honorary president of the "General Union of the Romanian Roma". Other well known compositions are: Hora mărțișorului (Mărțișor, literally "little March", is a major Romanian seasonal holiday on March 1st), Ceasornicul (The Clock) and Căruța poștei (The Post Wagon).
He was born in Bucharest, in the neighborhood of the lăutari named Scaune (Chairs). Because his father was busy with his activity as a lăutar, he handled him to "moș Zamfir", an old violinist, who taught him the first tunes. He attended the Bucharest Conservatory, where he studied with Dumitru Georgescu-Kiriac. The most famous of his teachers was Carl Flesch, the violin pedagogue, with whom he studied in 1902. He received a scholarship at the Vienna Conservatory, but he was not allowed to go there because he was Romani, an episode that he never forgot.
After graduation he played violin with the Orchestra of the Ministry of Public Instruction, and also performed as a soloist. Hora staccato dates from the beginning of this period; he wrote it as a graduation exercise. For forty years, from 1906 until 1946, he directed popular music concerts. He also toured abroad as a soloist and conductor, and he also played a great deal of light music in nightclubs, hotels, restaurants, and cafés in Bucharest and throughout Western Europe.