The two trade bodies currently represent nearly 20,000 landlords.
The new merged trade body will be represented under the NLA brand.
The merger will mean a wider range of products and services being made available to members as well as a significant development of local landlord networks.
Current members of the NFRL will automatically become members of the NLA. The five existing directors at the NLA will remain in place but will be augmented by two former NFRL directors. One of the new NLA directors Barry Markham will become a vice chairman of the NLA.
NLA chairman David Salusbury says: “The aims and objectives of the NFRL and NLA are very similar. It is these synergies which make the merger an obvious next step for both organisations.
“The newly enlarged NLA, with almost 20,000 paid-up landlord members, is now the pre-eminent voice for the private-rented sector and this will mean increased commercial benefits to our members but also a greater ability to influence policy at all levels. At a time of doom-mongering headlines about the housing market, this merger is good news for the entire private-rented sector.”