Bispecific antibodies binding ALK-1 and BMPR-2 The present invention relates to bispecific antibodies binding human ALK-1 and human BMPR-2. Also provided are BsABs which are agonists of ALK-1/BMPR-2 signaling, and BsABs which do not trigger osteogenic signaling. Furthermore, the invention relates to pharmaceutical uses of the BsABs, in particular for the treatment of pulmonary hypertension. Also provided are methods to screen for BsABs for use in the therapy, e.g. of pulmonary hypertension.