The international concept of "e-Navigation" has been in development for over a decade led by IMO, IALA, and other international maritime bodies. The concept of River Information Services (RIS) has been developed and implemented on waterways around the world since the 1990s. While these concepts have developed in parallel, there has not been close coordination between the. At the same time, the technologies and concepts central to e-Navigation (such as AIS and Vessel Traffic Services) are also included in RIS. The PIANC RIS Guidelines were first published in 2002, with the latest edition published in 2011. The Guidelines are currently under revision, and as part of this effort a study was conducted to investigate the applicability of e-Navigation developments to RIS that may be appropriate for incorporation into the updated Guidelines. This paper and presentation will summarize the e-Navigation and RIS concepts, identify similarities and differences in their structure and implementation, and identify opportunities for harmonization between RIS and e-Navigation. In particular, the close parallels between the suite of RIS Services and Key Technologies, and the developing e-Navigation Maritime Service Portfolios will be addressed. It is possible that these services can be harmonized to the mutual benefit of RIS and e-Navigation, and that additional benefits can be realized for maritime and inland waterborne transport.