  We establish local regularity theory for parabolic systems of Uhlenbeck type
with $\varphi$-growth. In particular, we prove local boundedness of weak
solutions and their gradient, and then local H\"older continuity of the
gradients, providing suitable assumptions on the growth function $\varphi$. Our
approach, being independent of the degeneracy of the system, allows for a
unified treatment of both the degenerate and the singular case.
