K0

K0 may refer to:
 * Spectral class K0, a star spectral class
 * the 1965 first model of the Honda CB450 motorbike
 * the Grothendieck group in abstract algebra
 * the Lateral earth pressure at rest
 * the neutral kaon, a strange meson with no charge in nuclear physics
 * K0 may refer to Khinchin's constant
 * K0 the order-zero graph