Accion East, a US-based Kiva Partner, charges interest (despite having some visible Muslims apply for loans with them).
Kiva Support writes:
Accion East does charge interest:
“Accion East offers competitive fixed interest rates that range from 8.99% to 15.99%. Our average term is between 2 and 3 years, although in some instances terms may go up to 60 months (5 years). Closing fees range from 3% to 6%.”