Semmy Schilt , also known as Sem Schilt , (born October 27, 1973) is a professional Dutch kickboxer, mixed martial artist, Daido Juku karate practitioner and three time consecutive K-1 World GP champion. He is the first fighter in K-1 history to win the championship three times in a row.

November 19, 2005 K-1 Grand Prix -As an Ashihara Karate fighter, Schilt beat defending champion Remy Bonjasky by knockout in the 2005 K-1 Grand Prix semifinals. Schilt then met Glaube Feitosa in the tournament finals and won by knockout due to knee strike.

On December 31, 2005 he also defeated former four time K-1 World Grand Prix champion Ernesto Hoost.

Schilt lost twice in 2006 against Peter Aerts and Hong Man Choi but still made it to the finals after beating Bjorn Bregy by knockout. He defended his title after defeating Jerome Lebanner, Ernesto Hoost and Peter Aerts all by unanimous decisions.

On April 3, 2007 he defeated Ray Sefo by 2nd rd. KO to become K-1's first Super Heavyweight Champion at K-1 World GP 2007 Yokohama.

Semmy faced and defeated K-1 Hawaii GP Champion Mighty Mo by unanimous decision on June 23rd, 2007 at the K-1 Amsterdam GP.

At the 2007 K-1 World Grand Prix Final Eliminations in Seoul, South Korea, Schilt faced Paul Slowinski. He won by KO in the first round from a knee strike. With the win, he qualified for the World Grand Prix Finals.

In the first round of the World Grand Prix Finals, Schilt was matched against Brazilian Karate fighter Glaube Feitosa. Semmy survived a near knockdown to win by unanimous decision, beating Feitosa for the 3rd time.

In the semi finals he met Jerome LeBanner for the second time. Schilt was put on the defensive for most of the first round. Just before time expired, Schilt landed a knee strike which badly hurt LeBanner. Before the second round started, LeBanner was noticeably limping in his corner. Early in the second round, a low kick from Schilt sent him to the canvas in obvious pain. LeBanner was able to make it back to his feet however his corner threw in the towel to avoid further injury.

The final match of the 2007 K-1 World Grand Prix was a rematch from the year before, with Schilt matched up against fellow Dutchman Peter Aerts for the third time. The match came to an abrupt end 1:49 in after Aerts injured his knee and could not continue. With the win Schilt became the third man to win the K-1 World Grand Prix three times, and the only man in history to win three consecutive Grand Prix crowns.

In September 2008, Schilt lost a decision against Peter Aerts at the K-1 World Grand Prix round of 16 in Seoul.

Semmy had a small role in the feature film Transporter 3 as a henchman.