Yoshiaki Ishizawa, 79, was honoured for decades of work in helping preserve the historic landmark after the 12th- century temple complex barely survived years of war and civil strife, the award foundation said.
Aside from rallying international support to preserve the structures, the Japanese scholar was also cited for raising awareness among Cambodians of Angkor Wat's importance to their heritage.
"The protection and restoration of the sites of Cambodia should be carried out by the Cambodians, for the Cambodians," the award foundation quoted him as saying.
Gethsie Shanmugam, 83, a Tamil psychological counsellor, also received the award for addressing emotional damage, particularly among women and children, who suffered from violence and disasters in her native Sri Lanka.
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Her work covered the brutal Sinhalese-Tamil civil war and the 2004 tsunami, the foundation noted.
Indonesian Abdon Nababan, 53, also received the award for organising indigenous people in his country to assert their rights on issues like the forest lands in their territories.
Lawyer Lilia de Lima, 76, was cited for her leadership of a government agency overseeing the Philippines' export processing zones, turning the overstaffed, inefficient institution into one that has won widespread respect while boosting exports and attracting investments, the foundation said.
The Manila-based Ramon Magsaysay Award, named after a Filipino president killed in a plane crash, was established in 1957 to honour people and groups tackling development problems in Asia.