Dina is a unit of force intensity in the CGS System, defined as the force required to cause an acceleration of one centimeter per second squared in a body of mass equal to one gram, and is equivalent to 10 micro newtons (10-5 N).

Because of its small magnitude, compared to a force in newtons, this unit of measurement is generally used for surface tension measurements (dyn/cm), in precision scales, and in high precision devices.