The Trygg class was the third and last class of torpedo boats to be built for the Royal Norwegian Navy. The three Trygg ships were constructed from 1919 to 1921 at Moss Verft in Moss (Trygg) and Horten naval yard.

The last of the Trygg class of Royal Norwegian Navy torpedo boats was HNoMS Stegg. Her sister ships were Trygg and Snøgg. The Trygg class vessels were the only additions to the Norwegian fleet of torpedo boats between the First and the Second World Wars. At the outbreak of the Second World War the Trygg class was mobilised together with eight 2. class and six 1. class torpedo boats.