Octant

Octant may refer to:
 * Octant (solid geometry), one of the eight divisions of 3-dimensional space by orthogonal coordinate planes
 * Octant of a sphere, a spherical triangle with three right angles
 * Octant (plane geometry), one eighth of a full circle
 * Octant (instrument) for celestial navigation
 * Octans, a constellation also called The Octant
 * Octant (band), from Seattle, Washington