Kaas is a surname. Notable people with the surname include:
Carl Waaler Kaas (born 1982), Norwegian orienteering competitor Erling Kaas (1915–1996), Norwegian pole vaulter Frederik Christian Kaas (1725–1803), Danish admiral Frederik Christian Kaas (1727–1804), Danish admiral Herman Munthe-Kaas (1890–1977), Norwegian architect Hugo Munthe-Kaas (1922–2012), Norwegian intelligence agent and resistance fighter Jon Kaas, professor and scientist Ludwig Kaas (1881–1952), German priest and politician Niels Kaas (1535–1594), Danish politician and diplomat Nikolaj Lie Kaas (born 1973), Danish actor Patricia Kaas (born 1966), French singer and actress Preben Kaas (1930–1981), Danish actor
Danish naval officers For a list of 17 Danish naval officers with this surname, see Kaas (Danish Naval Officers)