K class or Class K may refer to:

• LB&SCR K class (1913), England
• SECR K and SR K1 classes (1914), England
• NZR K class (1877), New Zealand
• NZR K class (1932), New Zealand
• Tasmanian Government Railways K class, Tasmania
• Victorian Railways K class, Australia
• WAGR K class, steam, Western Australia
• WAGR K class (diesel), Western Australia

• K-class destroyer, British warships of World War II
• German K class cruiser, German warships of World War II
• K-class sloop, Dutch warships
• K-class submarine (disambiguation), several classes of warships
• British Columbia K-class ferry, Canadian ships
• Sydney K-class ferry, Sydney Harbour ferries
• K-class torpedo boat, Dutch warships

• K-class blimp, blimps built for the US Navy
• Class K, a classification for stars
• Energy class, an earthquake magnitude scale

This disambiguation page lists articles associated with the title K class.
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