6.28

6.28 may refer to:


 * An approximation of 𝜏 (tau), the circle constant equal to $2\pi$ (6.283 185  307  179  586...)
 * June 28, represented in the American date format as 6/28
 * Hopfner HV-6/28, a small airliner built in the late 1920s
 * Matthew 6:28, a Bible verse