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This study presents community forest management and eco-efficiency assessment of the community forest management in 19 districts of Chiang Mai Province. The study utilized in-depth interview questionnaire using quota sampling method. Descriptive statistics were used to analyze participation in community forest management. The ecological efficiency assessment of community forest management was analyzed using the data envelopment analysis (DEA) method. The study demonstrated that most of the community forest management in Chiang Mai area was derived from the support of sub-district administrative organization. The village committees were responsible for the community forests. The responsibilities of most participants included fire prevention, forest ordination ceremony, dam making, and reforestation. Community forest areas had laws and regulations, including penalties for those who committed smuggling and deforestation. Measuring the level of eco-efficiency of community forest management in Chiang Mai showed that total technical efficiency (CRS) at very high level, moderate level, and high level were 45.30%, 41.99%, and 12.71%, respectively. Technical efficiency rating VRS of most areas were at very high level (61.33%), followed by high level (24.31%), and moderate level (14.36%). For the scale efficiency SE, the majority of places was at very high level (85.64%), followed by high level (11.05%), and moderate level (3.31%). However, the efficiencies of community forest management characterized by IRS, CRS and DRS were 64.01%, 30.09%, and 4.97%, respectively.