In thermodynamics, Gibbs' Phase Rule; describing states of other systems by specification of three coordinates and three momenta for every particle in the system, yes.

It's interesting that "degrees of freedom" has two different definitions. In some contexts, it means the cardinality of the set of state variables. (e.g. http://en.wikipedia.org/wiki/Degrees_of_freedom_(mechanics) ) rather than the set of state variables itself.