Witthayu Road (Thai: ถนนวิทยุ, RTGS: Thanon Witthayu, pronounced [tʰā.nǒn wít.tʰā.júʔ]), commonly known in English as Wireless Road, is a road in Bangkok, located almost entirely in Lumphini Subdistrict of Pathum Wan District.Witthayu Road originally linked Phloen Chit Road to Rama IV Road, running from what is now Phloen Chit Intersection to Witthayu Intersection, where it continues on as Sathon Road.