Systems for contactless authentication and event processing are provided. In some examples, a user may request processing of an event. The user may provide user identifying or event identifying information that may be transmitted to contactless processing computing platform. Based on the user identifying information, additional user data may be retrieved. An interactive authentication request may be generated and transmitted to the user computing device. The interactive authentication request may include a request for one or more types of authentication data. The user may input authentication response data into the user computing device, which may then be transmitted to the contactless processing computing platform for evaluation. The authentication response data may be evaluated to determine whether it includes a trigger, whether it matches pre-stored authentication data, and the like. In response, one or more authentication outputs may be generated and/or the requested event may be processed or denied.