Dato John Ha Tiong Hock (born 5 March 1947) is a Malaysian prelate of the Roman Catholic Church.

[2] After a two-year pastoral work back in the Archdiocese of Kuching, Ha was appointed to teach Bible at College General.

[4][2] After several years of serving as archbishop, Ha revealed that he was increasingly feeling his age after it gradually showed symptoms.

He took a considered decision to write a letter to Fernardo Cardinal Filoni, requesting the appointment of an auxiliary bishop.

[6] On 4 March 2017, Ha tendered his resignation from the archbishop's office, deliberately coinciding with his seventieth birthday.

The following day, Pope Francis accepted Ha's resignation and appointed Auxiliary Bishop Simon Peter Poh Hoon Seng as his successor.