The religious edict by the Indonesian Ulema Council said it was against Islamic law, for Muslims to start fires on purpose in forests or on plantation land.
"The Koran states that we are not allowed to harm the environment, and forest burning causes damage not only to the environment but also to people's health -- even neighbouring countries are complaining," Huzaemah Tahido Yanggo, head of the body's fatwa council, told AFP.
The blazes last year were among the worst in memory and cloaked large parts of Indonesia, Malaysia and Singapore in choking smog for weeks.
Environment and Forestry Minister Siti Nurbaya Bakar welcomed the fatwa and said she hoped Islamic preachers would spread news of it to local communities: "The most important follow-up is communicating it to the public."
Fatwas have no legal force and are aimed at encouraging the devout in the world's most populous Muslim-majority country against taking a certain course of action.
The council has previously issued fatwas to protect the environment, including one against the illegal hunting and trade in endangered animals in the biodiverse country, which environmentalists said was the world's first.
The move by the clerics follows efforts by Jakarta to prevent a repeat of last year's haze disaster. Authorities plan to stop granting new land concessions for palm oil plantations, and have established a new agency to restore millions of hectares of carbon-rich peatlands susceptible to fires.
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