Kaylen Frederick (born 4 June 2002) is an American racing driver of German descent who is currently competing in the IMSA SportsCar Championship with JDC–Miller MotorSports. He was the last champion of the British Formula 3 Championship in 2020. He previously competed in Super Formula Lights with B-Max Racing Team.

Frederick began his racing career in karting at the age of seven, where he remained active until 2015.

In 2016, Frederick switched to formula racing at the age of fourteen, where he competed in the F1600 Championship Series with Team Pelfrey. Due to his age he had to miss the first six races, but was nevertheless successful by taking his first single-seater win at the Pittsburgh International Race Complex and three second-place finishes. With 474 points, he finished seventh in the championship. Later in the year, he made his U.S. F2000 debut for Pelfrey on the final race weekend at Laguna Seca, becoming the youngest driver to race in the series where he finished thirteenth in both races and ended 24th in the standings. He also drove for Pelfrey in the season finale of the F2000 Championship at Virginia International Raceway. He immediately took pole position, but finished seventh in the first race, while failing to finish the second race.

The following year, Frederick competed full-time in U.S. F2000 with Team Pelfrey. He took his first podiums at Barber Motorsports Park, scoring a pair of second places, after being bested by Oliver Askew. Indianapolis Motor Speedway was positive with a third-place finish in the second race, although he would have achieved more without a disqualification from second place in the first race. He scored only two more third places that season at the Toronto Street Circuit and Mid-Ohio Sports Car Course. With 240 points, he finished fourth in the standings behind Oliver Askew, Rinus VeeKay and Parker Thompson, the highest driver not to win a race. He also drove an F2000 Championship Series weekend at Mid-Ohio, where he earned pole position and a podium finish.

In 2018, Frederick took another shot at U.S. F2000 with Pabst Racing Services. He achieved all his four podium finishes consecutively, at Lucas Oil Raceway, Road America and Toronto, taking three second places and one third place. However, his season was much more inconsistent compared to the previous year, and he finished sixth in the final standings with 173 points. Frederick also drove in the first race weekend of the Formula 4 United States Championship in Virginia with the K-Hill Motorsports team, but managed only a retirement, 23rd and 12th in the races. At the end of the season, Frederick drove for the first time in Europe for two Euroformula Open race weekends with RP Motorsport. He achieved two top ten finishes in four races, with a fifth place at the Monza as his best result. With 21 points, Frederick finished fourteenth in the final standings.

In 2019, Frederick switched full-time to racing in Europe and was expected to race in the Euroformula Open, but instead competed in British Formula 3 with Carlin. He achieved his first win on his first weekend at Oulton Park during the second race. Two more third places at Snetterton and Silverstone followed, before he added a second victory at Spa-Francorchamps. He failed to make the podium for the last three rounds and ended ninth in the standings.

Frederick remained with Carlin in BRDC F3 for 2020, partnering Guilherme Peixoto and Nazim Azman. He started his season in Oulton Park with two wins. At the first Donington Park round, Frederick once again won and also secured a second place. A blip of form followed in Brands Hatch, but the second Donington round saw the American victorious, which also applied to the next round in Snetterton Circuit. Having been nine points behind championship rival Kush Maini, Frederick's pace skyrocketed for the final two rounds, taking four victories, two each in Donington and Silverstone which allowed him to surpass Maini's points tally. Frederick secured the title during the final race, beating Maini by 51 points. Throughout the season, Frederick achieved nine wins and three more podiums.

In 2021, Frederick progressed to the FIA Formula 3 Championship. Remaining with Carlin, he was partnered by Ido Cohen and Red Bull Junior Jonny Edgar. Frederick had a solid debut in the championship, achieving a best finish of 17th twice during the first two rounds. During the Austrian round, Frederick claimed his first F3 points after multiple penalties promoted him to ninth place in race 1. Starting fourth for race 2, Frederick impressively maintained his position in the top 5. On lap 11, he made a late dive on Juan Manuel Correa which spun both around, and Frederick retired on the spot. It was later discovered that Frederick suffered a fracture dislocation in his left thumb, causing him to miss race 3. He also missed the Budapest round due to the injury and was substituted by Jake Hughes. In addition, he did not compete in Spa-Francorchamps after testing positive for COVID-19. He returned in Zandvoort, and achieved 11th place in just his second race on his return. Frederick scored two points, besting out Cohen, who scored 0 points, but got outlasted by Edgar, who scored 23 points. He then tested for Hitech Grand Prix during the post-season test.