How are terror threats and counterterrorism measures experienced in everyday urban spaces? We argue that thinking atmospherically about the spaces of urban encounters with (counter)terrorism is important, firstly, to identify and question feelings and dispositions shaped by discourses, practices, and infrastructures of (counter)terrorism; secondly, to contribute spatial perspectives of felt experience to literatures on security and (counter)terrorism in geography and beyond; thirdly, to connect official understandings of (counter)terrorism with its everyday felt experiences and materialities. We highlight two conceptual and empirical arenas – the crowd and the question of difference – where atmospheric approaches to urban (counter)terrorism can be developed.