There were 1.95 million mainland Chinese visitors to Vietnam between January-April, up 56% year-on-year, according to the General Statistics Office (GSO).
South Korea ranked second at 1.58 million, followed by Taiwan (440,000), the U.S. (323,000), and Japan (280,000).
The rest of the top 10 markets were Cambodia (279,000), Australia (205,000), India (203,000), Malaysia (182,000) and Thailand (169,000).
Favorable visa policies, tourism promotion programs, and the organization of major celebrations in April for Vietnam's 50th reunification anniversarty have contributed to an increase in the number of foreign visitors to Vietnam, GSO said.
Vietnam eyes 22-23 million foreign arrivals this year.