Jaroslav Olesnitsky (Ярослав Іванович Олесницький) (born: 1875, Halych, Ivano-Frankivsk Oblast - died July 15, 1933, Zolochiv, Lviv oblast) was a Ukrainian diplomat, politician, and lawyer.

28 January 1919 - he appointed First Counsellor of the diplomatic mission of the Ukrainian People's Republic which began work in London in May 1919.

From September 1919 to January 1920 - he acted as temporary head of the Ukrainian mission in London.

In August 1920 to 1921 - he became head of the Ukrainian mission to the United Kingdom.

From 1930 - he represented the Ukrainian National Democratic Alliance to the Sejm of the Polish Republic.