Thornthwaite is a small village in the Harrogate district of North Yorkshire, England. It lies in the valley of Padside Beck, a side valley on the south side of Nidderdale, west of Harrogate. Padside Beck is crossed by a packhorse bridge thought to date from the 15th century. It was probably on a packhorse route from Ilkley to Fountains Abbey, and may have been constructed by the abbey. The bridge is a Scheduled Ancient Monument. Thornthwaite is the largest settlement in the civil parish of Thornthwaite with Padside, historically a township in the ancient parish of Hampsthwaite. It became a separate civil parish in 1866. The parish includes the hamlet of Padside, a mile west of Thornthwaite, and extends north-west of the village to the upper valley of the River Washburn. The population of the parish is estimated at 220, In the 2011 census the population of the parish was included with Thruscross, and the total of the two parishes was 312. References External links Villages in North Yorkshire Nidderdale