Title: Concentric Ring Loss for Face Forgery Detection. Abstract: Due to growing societal concerns about indistinguishable deepfake images, face forgery detection has received an increasing amount of interest in computer vision. Since the differences between actual and fake images are frequently small, improving the discriminative ability of learnt features is one of the primary problems in deepfake detection. In this paper, we propose a novel Concentric Ring Loss (CRL) to encourage the model to learn intra-class compressed and inter-class separated features. Specifically, we independently add margin penalties in angular and Euclidean space to force a more significant margin between real and fake images, and hence encourage better discriminating performance. Compared to softmax loss, CRL explicitly encourages intra-class compactness and inter-class separability. Moreover, a frequency-aware feature learning module is proposed to exploit high-frequency features and further improve the generalization ability of the model. Extensive experiments demonstrate the superiority of our methods over different datasets. We show that CRL consistently outperforms the state-of-the-art by a large margin.