Arm for awnings relating to an arm of the type formed by two profiles ((2),(3)) articulated with respect to each other and which has internal means for the tension between the latter, bending to maintain it in an open position, with the particularity that said arm has an improved structural configuration, with respect to other known systems, and which provides the arm with technical advantages, the asymmetry of the profiles standing out in particular, one concave and another convex, which allows the arm to compact in the closed position and save space.