| Yukhym Medvedev|
| 28 December 1917|
25 July 1938
| All-Ukrainian Congress of Soviets|
Resignation, dismissal or new convocation of congress of Soviets.
28 December 1917 - 17 March 1918—Yukhym Medvedev
25 March 1918 - 18 April 1918 -- Volodymyr Zatonsky
10 March 1919 - 25 July 1938—Hryhoriy Petrovsky
Chairman of Central Executive Committee (Ukraine) Wikipedia
The Chairman of CEC USSR (Ukrainian: Голова ЦВК УСРР, Holova TsVK USRR) was the speaker of the Central Executive Committee, Ukraine's unicameral parliament. In July 25, 1938 it was replaced with the Chairman of the Verkhovna Rada.
From December 30, 1922 to January 12, 1938 the position was also co-chairman of the Central Executive Committee of the Soviet Union.