Ioan Ploscaru (19 November 1911 – 31 July 1998) was a Romanian bishop of the Greek-Catholic Church. Born into a peasant family in Frata commune, Cluj County, he studied in Blaj. He was ordained a priest in 1933 and a bishop in November 1948. The latter ordainment was performed in secret by bishop Gerald O'Hara, shortly after the new Communist regime outlawed the church and arrested his predecessor, Ioan Bălan. Himself arrested in August 1949, Ploscaru spent a number of years in detention, including at the notorious Sighet Prison.