Sydney 'Sid' Herbert Nicholls (29 May 1868 – 24 November 1946) was an English-born dual code rugby forward who played club rugby under the union code for Cardiff and in his later years league rugby with Hull. Nicholls won four caps for Wales and was part of the Welsh team that beat the first touring Southern Hemisphere team the New Zealand Natives. He was the elder brother of Wales rugby legend Gwyn Nicholls, and his son Jack Nicholls was a Welsh international footballer.