Half of all Federal National Council (FNC) members must now be women.
President His Highness Sheikh Khalifa bin Zayed Al Nahyan said the change will be in effect from the upcoming legislative cycle.
It means that 20 of the 40-member strong house will be women.
The ruler of each emirate will now determine the number of seats allocated for women when electing their emirate’s representatives in FNC.
Leading Emirati women have praised the decision.
FNC Speaker Dr. Amal Abdullah Al Qubaisi and Her Highness Sheikha Fatima bint Mubarak, Chairwoman of the General Women's Union, both said the move is a step in the right direction.

H.H. Sheikh Mohammed announces launch of Dubai research campus 'Nad Zabeel'
UAE strongly condemns attack on Qatari gas tanker in Arabian Gulf
H.H. Sheikh Khaled meets global leaders in energy, AI at Abu Dhabi's ENACT Majlis
Sharjah airlifts 140 tonnes of essential aid for winter to Gaza
Dubai Municipality expands Al Satwa's plot regulations