Prajadhipok Road (Thai: ถนนประชาธิปก, RTGS: Thanon Prachathipok, pronounced [tʰā.nǒn prā.t͡ɕʰāː.tʰí.pòk]) is a road in Thon Buri District, Bangkok. It begins at Wongwian Yai and runs northeast, passing Ban Khaek Intersection, where it meets Itsaraphap Road. It continues past Wongwian Lek, crossing Khlong Somdet Chao Phraya just before reaching the roundabout, and passing in front of Suksanari School and the clock tower at Wongwian Lek.
The road then splits into three routes. One branch veers slightly left, passes beneath the approach to the Memorial Bridge, curves toward Wat Prayurawongsawat, and loops under the bridge to connect with Phaya Mai Road, an area known for another Buddha amulet market in Bangkok apart from Tha Phrachan, on the Wongwian Lek side. The second branch continues straight across the Memorial Bridge toward the Pak Khlong Talat area in Wang Burapha Phirom Subdistrict, Phra Nakhon District. The third branch leads onto Phra Pok Klao Bridge, which runs parallel to the Memorial Bridge. At the end of the bridge, it splits again into two directions, one descending into the Phahurat area in Wang Burapha Phirom Subdistrict, Phra Nakhon District, and the other veering right toward the Chakkrawat area in Samphanthawong District.
The road also serves as a boundary line. From its starting point at Wongwian Yai to Ban Khaek Intersection, the side leading toward the Memorial Bridge is within Hiran Ruchi Subdistrict, and beyond that point it becomes Wat Kanlaya Subdistrict. Both subdistricts belong to Thon Buri District, while the opposite side is entirely within Somdet Chao Phraya Subdistrict of Khlong San District.
It was constructed in 1929 as the first road in a project to build 11 roads on the Thonburi side (the west bank of the Chao Phraya River), intended to support the future growth of land transportation. In 1932, marking the 150th anniversary of Rattanakosin (Bangkok), the government under King Prajadhipok (Rama VII) launched a megaproject to construct the Memorial Bridge, connecting Phra Nakhon (the main core of Bangkok) with Thonburi. After its completion, the road was named "Prajadhipok" in honor of the king.
Since March 2024, Prajadhipok Road between Ban Khaek Intersection and the area in front of Suksanari School has experienced traffic congestion due to the construction of Saphan Phut Station (PP24), an underground station on the MRT Purple Line extension (Tao Poon–Rat Burana, Kanchanaphisek Ring Road). As a result, traffic flow in the area has had to be reconfigured.