Title: Orthogonal Subspace Decomposition: A New Perspective of Learning Discriminative Features for Face Clustering. Abstract: Face  clustering  is  an  important  task,  due  to  its  wide  applications  in  practice. Graph-based  face  clustering  methods  have  recently  made  a  great  progress  and achieved new state-of-the-art results. Learning discriminative node features is the key to further improve the performance of graph-based face clustering.  To this end, we propose subspace learning as a new way to learn discriminative node features, which is implemented by a new orthogonal subspace decomposition (OSD) module. In graph-based face clustering, OSD leads to more discriminative node features,  which better reflect the relationship between each pair of faces, thereby boosting the accuracy of face clustering.  Extensive experiments show that OSD outperforms state-of-the-art results with a healthy margin.