Scuba Educators International (SEI) is an underwater diving training organization established in the United States during 2008 to continue the underwater diving training program known as the YMCA SCUBA Program which ceased operation in 2008 and the PDIC Diving program becoming Scuba Educators International (SEI) in 2008.

Scuba Educators International was founded in 2008 by a group of former senior YMCA SCUBA instructors following the announcement of the closure of the YMCA Scuba Program by the YMCA of the USA with the intention of continuing the YMCA Scuba Program under a new banner. The new agency was conceived as being an organization that would operate world-wide and in complete independence of the YMCA of the US, “but will continue to share philosophies and dedication to the highest quality education in the (diving) industry”.

During 2010, Scuba Educators International entered in an agreement with the Underwater Society of America (USOA) to issue CMAS International Diver Training Certificates. Scuba Educators International is a member of the Diving Equipment and Marketing Association (DEMA) with its CEO, Jim Gunderson, serving on the DEMA Board of Directors.

The SEI Qualification System was structured as of July 2014.

The following equivalencies were agreed by the USOA and SEI during 2010.