K45

K45 may refer to:


 * K-45 (Kansas highway), now part of U.S. Route 56
 * Dialog K45, a Sri Lankan smartphone
 * HMS Convolvulus (K45), a corvette of the Royal Navy
 * INS Vibhuti (K45), a corvette of the Indian Navy
 * Junkers K 45, a German transport aircraft
 * Potassium-45, an isotope of potassium
 * Symphony No. 7 (Mozart), by Wolfgang Amadeus Mozart