The Hungarian Reformed Church (HRC) was formed in the 16th century. It is a confessional church with its standards of faith based on the Heidelberg Catechism.

PCI began to develop its relationships with HRC in the mid 1980s and by 1988 a number of direct congregation-to-congregation links had been established. 

Youth and congregational teams have helped develop and strengthen relationships with HRC and its youth wing IKE. Working with local church-based youth groups, IKE provides leadership training for young people and amongst other work, they are involved in running summer camps.  

PCI global mission workers Csaba and Ilona Veres serve in the the Hungarian Reformed Church’s social action ministry in Transylvania (in north west Romania), called the Diakonia which was founded in 2001. The Diakonia is involved in children's work, elderly and palliative care and work with street children. Ilona is based in the village of Mera working with the Roma community. Csaba co-ordintes the Diakonia's work in Salaj county.

PCI has sponsored a number of HRC leaders-in-training, who have come to study at Union Theological College in Belfast.