  We study the regularity of solutions of elliptic fractional systems of order
2s, $s \in (0, 1)$, where the right hand side f depends on a nonlocal gradient
and has the same scaling properties as the nonlocal operator. Under some
structural conditions on the system we prove interior H\"older estimates in the
spirit of [1]. Our results are stable in s allowing us to recover the classic
results for elliptic systems due to S. Hildebrandt and K. Widman [6] and M.
Wiegner [9].
