Digital content rendering coordination techniques in augmented reality are described. In one example, a user is provided with a first display device via which an augmented reality environment is to be viewed that includes at least a partial view of a physical environment. As part of this physical environment, a second display device (e.g., a desktop monitor, a mobile phone, and so forth) is also viewable by a user through the first display device, i.e., is directly viewable. Techniques are described herein in which a view of digital content on the second display device is coordinated with a display of digital content on the first display device. This may be used to support a variety of usage scenarios to expand and share functionality associated with these different devices.