Jarosław Ludomir Łomnicki (19 May 1873 – 15 April 1931) was a Polish geologist and entomologist. Son of the paleontologist Marian Łomnicki, he succeeded as curator of the Dzieduszycki Museum in Lviv. Łomnicki was born in Stanisławów (Stanisau), Galicia to Marian Łomnicki. The family moved to Lviv in 1879 where he went to school and gymnasium. His father was involved in museum work and as a young boy he too was introduced to it and travelled on collection trips into Galicia. After graduation, he joined Lviv University in 1891 and then worked as a zoology assistant at the Jagiellonian University