Disclosed herein are example embodiments for multi-device behavioral fingerprinting by a user device or a server device. For certain example embodiments, at least one device may obtain at least one behavioral fingerprint that is associated with at least one authorized user, with the at least one behavioral fingerprint including one or more indicators of utilization of two or more user devices by the at least one authorized user. The at least one device may perform at least one authentication-related operation based at least partially on the at least one behavioral fingerprint.