Conventional farming system is agricultural system that apply synthetic fertilizers and pesticides that effects negative impact on ecosystems such as the emergence of pest resistance. Meanwhile, organic mina rice farming system that depend on organic sources in the environment have a positive impact and decline the pest populations. Rice planting systems affect pest biodiversity, so identification of pest species and populations in conventional paddy fields and organic mina paddy fields is very important. This study aims to examine the effect of organic mina and conventional paddy fields on pest diversity. The study was conducted by survey methods in organic mina and conventional paddy fields in Jlegongan, Seyegan District, Sleman, Yogyakarta. Pest sampling was collected by purposive sampling using Yellow sticky trap and Sweeping net methods. Pest samples were taken twice dring vegetative phase and twice during generative phase. The results showed that the organic mina and conventional paddy fields system affected pest diversity, which contained 9 pest families in the organic mina paddy field and 10 families in conventional paddy fields. While the abundance of pests counted from the average number of individual pests on organic mina paddy fields was higher than conventional paddy fields.