Radziszewo-Sieńczuch [rad͡ʑiˈʂɛvɔ ˈɕɛɲt͡ʂux] is a village in the administrative district of Gmina Ciechanowiec, within Wysokie Mazowieckie County, Podlaskie Voivodeship, in north-eastern Poland. It lies approximately 12 kilometres (7 mi) east of Ciechanowiec, 30 km (19 mi) south of Wysokie Mazowieckie, and 60 km (37 mi) south-west of the regional capital Białystok.