Si Phraya Road is a road in Bang Rak District, Bangkok, Thailand. It divides the areas of Maha Phruettharam and Si Phraya subdistricts. Built in 1906 by four noblemen of the rank phraya, the road runs from Si Phraya Pier at the mouth of the Phadung Krung Kasem Canal to Sam Yan Intersection, where it meets the Phaya Thai and Rama IV Roads.