Hyun Jae-Hyun (born February 12, 1949) is chairman of Tongyang Group, a South Korean conglomerate founded in 1957 as a cement manufacturer.

Starting in the mid-1980s, Hyun began diversifying the Tongyang Group's business structure, and by 1989, he re-introduced Tongyang into the business community as a finance-based service provider.

Today, in addition to being the second largest cement manufacturer in Korea, Tongyang offers a comprehensive range of financial services that include securities brokerage, investment banking, asset management and life insurance.

He was arrested on January 14, 2014 on suspicions of fraudulent sales of corporate bonds and commercial papers.

[1] He lives in Seoul with his wife and four children.