Sigmund Kvaløy Setreng (20 September 1934 – 27 May 2014) was a Norwegian philosopher, illustrator, mountain climber, environmental activist and politician.
He was born in Trondheim.
Among his publications are Musikk-kritikk og kommunikasjon from 1966, Økokrise, natur og menneske from 1976, and Mangfold og tid.
Pyramide-mennesket ved skillevegen: System, frihet eller kaos? from 2001.