Garth Alan Carnaby CNZM (born 1950) is a New Zealand fibre physicist and science and public administrator.

The title of his doctoral thesis was The structure and mechanical properties of wool carpet yarns.

[4] Carnaby served as president of the Royal Society of New Zealand from 2009 to 2012, preceded by Neville Jordan and followed by David Skegg.

[10] In the 2006 Queen's Birthday Honours, Carnaby was appointed a Member of the New Zealand Order of Merit, for services to the wool industry.

[11] He was promoted to Companion of the same order in the 2018 New Year Honours, for services to science and governance.