The Ottawa Real Estate Board better know as OREB is a non-profit association of registered brokers and salespeoples in Ottawa, Ontario, Canada. It is home to Ottawa's Multiple Listing Service (MLS). Members of OREB are licensed by the Real Estate Council of Ontario (RECO) to trade in real estate sales in Ontario. It's members are permitted to use such term as REALTOR®. This trademark is owned by the Canadian Real Estate Association (CREA).