| Petro Kozak | |
| Birth Name: | Petro Kozak |
| Birth Date: | 1911 4, df=yes |
| Birth Place: | Loshniv, Austrian-Hungarian Empire, now Ukraine |
| Death Place: | Vodyane, Soviet Union, now Zymna Voda, Ukraine |
| Church: | Ukrainian Greek Catholic Church |
| Bishop Of: | Ukrainian Catholic Archeparchy of Lviv (auxiliary) |
| Appointed: | 1983 |
| Ordination: | 25 July 1937 (Priest) |
| Ordained By: | Bl. Nicholas Charnetsky |
| Consecration: | 1983 (Bishop) |
| Consecrated By: | Volodymyr Sterniuk |
Petro Kozak, C.Ss.R. (uk|Петро Козак; 4 April 1911 – 9 December 1984) was a Ukrainian Greek Catholic clandestine hierarch. He was an auxiliary bishop of the Ukrainian Catholic Archeparchy of Lviv from 1983 to 1984.
Born in Loshniv, Austro-Hungarian Empire (present-day – Ternopil Oblast, Ukraine) in 1911 and in 1931 joined the missionary Congregation of the Most Holy Redeemer.[1] He was professed on 26 June 1932, solemn professed on 21 September 1935 and was ordained a priest on 25 July 1937 by Blessed Bishop Nicholas Charnetsky, C.Ss.R. during his studies in Belgium.[1] He was imprisoned in May 1950, because the Communist regime abolished the Greek-Catholic Church, and exiled to Siberia. Released from prison in October 1960 and clandestinely continued to serve as priest.[1]
On 1983 Fr. Kozak was consecrated to the Episcopate as auxiliary bishop. The principal and single consecrator was clandestine archbishop Volodymyr Sterniuk.[2]
He died on 9 December 1984.