Some demonstrative embodiments include apparatuses, systems and/or methods of communicating in a multicast group. For example, an apparatus may include logic and circuitry configured to cause a Neighbor Awareness Networking (NAN) device to process reception of a message including a scheduling attribute from a coordinator of a multicast group, the scheduling attribute comprising a service identifier (ID) corresponding to a service, scheduling information to indicate one or more timeblocks, a list of NAN devices belonging to the multicast group, and a scheduling rank of the coordinator; and based on the scheduling attribute, to connect with one or more NAN devices of the multicast group during at least one of the timeblocks to communicate traffic of the service.