Serhii Ivanovych Vasylkivsky (Ukrainian: ?????? ???????? ??????????????, pronounced [ser'?ij w?s?l?'kiu?s?k?j]; Russian: ?????ยด? ???????? ?????????????; October 19, 1854, Izium โ October 7, 1917, Kharkiv) was one of the most prolific Ukrainian artists of the pre-revolutionary period and an expert on Ukrainian ornamentation and folk art.