Billa (German: Billa) is a European supermarket chain operating in a large number of countries, initially in Austria. The owner of the chain is the German Rewe Group. The first store of the chain in Bulgaria was opened in 2000.

All BILLA stores in Bulgaria are equipped with hardware for POS systems from Eltrade – POS printers,
GPRS terminals, mobile terminals and embedded scanners.

Billa uses the electronic data interchange (EDI) service provided by Eltrade between the retail chain and its suppliers.