  Lorentz covariance is the fundamental principle of every relativistic field
theory which insures consistent physical descriptions. Even if the space-time
is noncommutative, field theories on it should keep Lorentz covariance. In this
letter, it is shown that the field theory on noncommutative spacetime is
Lorentz covariant if the noncommutativity emerges from the algebra of spacetime
operators described by Doplicher, Fredenhagen and Roberts.
