Charles Kwan Siu-Cheung (Traditional Chinese: 關兆昌, born September 3, 1963) is the most successful Hong Kong racing driver who has competed in the Macau Guia Race, Japan GT Championship, FIA GT Championship, Porsche Carrera Cup Asia, South East Asia Touring Car Zone Challenge (SEATCZC) and the Asian Touring Car Championship. He was the winner of the 1993 Guia Race, three times SEATCZC champion and the 2003 Porsche Carrera Cup Asia champion. He also performed roadtests and wrote columns for car magazines in Hong Kong.
Charles first came to prominence, after winning numerous supporting races in prior years, he won the Guia Race in 1993 in a DTM spec BMW M3 and two other races on the same weekend (one was the Supercar Challenge in a Porsche 911 and CTM Cup race). In the Supercar Challenge in 1994, he was the first driver to give the Ferrari F355 its first win on its race debut and for the following year, it was a Ferrari F50 he repeated the feat.
In 1994, he competed in the South East Asian Touring Car Zone Challenge (SEATCZC), driving a BMW M3 for Three Crowns Racing. In the Zhuhai street race supporting the BPR Global GT Series, Charles had qualified his BMW M3 second on the grid. Right at the race start, both Charles and fourth place starter Henry Lee Junior were hit by Thailand's S. Prutarit and Man Manit, who drove Mercedes Benz 190Es for AIM Motorsport and were on pole position and third place. Both Charles and Henry retired as a direct result. In a 2006 interview with Car Plus magazine, Charles said he still considers that to be his most memorable race, due to the unsporting behaviour against him.
Charles went on to beocome 3 times champion of the SEATCZC from 1997 to 1999, driving a Super Touring BMW 318i for EKS Motorsport and sponsored by Total/Fina.