The importance of Naga plastic arts has two aspects: (a) In terms of the research value, Naga is an important design element in Buddhist temples in Thailand. It is particularly seen in architectural decoration and sculptures, yet little research has been done on Naga; (b) Naga plastic arts of Northern Thailand also have local characteristics. Buddhist temples are important places for observing Buddhist art. Chiang Mai was the capital of the Lanna Kingdom from the 13th century, so the city has many important Buddhist temples. In other words, the Buddhist temples in Chiang Mai are representative of Lanna culture. This study involved field research, recording Naga plastic arts in 34 Buddhist temples of the Mueang Chiang Mai District. The purpose of this paper is to discuss the characteristics of Naga plastic arts in Northern Thailand. The results of this research show that Naga plastic arts of Northern Thailand were influenced by Lanna culture, as revealed by their motifs, shapes, patterns, etc.