Luts, a 21-year-old native of Lviv in western Ukraine, took the competition's top honour, beating two other finalists: 19-year-old Chinese violinist Jinzhu Li, who won second prize, and 26-year-old South Korean SooBeen Lee, who finished third.
The jury announced the results shortly before midnight.
Luts won EUR 60,000 in prize money, along with a range of career-development opportunities, including international tours in South Korea, China, Taiwan, Italy and Brazil, as well as concerts in Poland.
A total of 48 violinists, including eight Poles, took part in this year's competition, which began on October 8 and ended on Thursday night.
In their final appearance before the jury on Thursday, the finalists performed one of two concertos by Henryk Wieniawski, the Polish virtuoso after whom the competition is named: Violin Concerto No. 1 in F-sharp minor, Op. 14, or Violin Concerto No. 2 in D minor, Op. 22.
They were accompanied by the Poznań Philharmonic orchestra under its music director, Łukasz Borowicz.
The 10-member international jury was chaired by Polish violinist Bartłomiej Nizioł, who won the 1991 Wieniawski Competition. The panel also included Andrea Obiso, Liviu Prunaru, Gerhard Schulz, Alexander Sitkovetsky, Akiko Suwanai, Agata Szymczewska, Vera Tsu Weiling, Sungsic Yang and Nancy Zhou.
The Wieniawski Competition is the world's oldest international violin competition, according to its organisers.
It was first held in Warsaw in 1935 and moved to Poznań after a 17-year hiatus. It has been held in Poznań since 1952, usually every five years.
Past winners have included David and Igor Oistrakh, Ida Haendel, Ginette Neveu, Agata Szymczewska, Veriko Tchumburidze and Hina Maeda.
Wieniawski was a child prodigy who entered the Paris Conservatory at age 8. He is widely regarded as one of the greatest violinists and composers of 19th-century violin music after Niccolò Paganini. He died in 1880 at age 45.
(gs)
Source: PAP