An identity management method includes comparing person-to-person relationship data of at least two identifiers of individuals to determine if the at least two identifiers have a relationship with a common third party identifier. The person-to-person relationship data is obtained from one or more sources and the at least two identifiers are the same or similar. When it is determined that the at least two identifiers have a relationship with a common third party identifier, the method further includes generating an output indicating that the at least two identifiers actually identify the same individual. The output can alternatively, or further, include a confidence level indicative of the confidence that the at least two identities do indeed identify the same individual. The person-to-person relationship analysis can be combined with other forms of identity matching, e.g., demographics.