Niklas Kaul (; born 11 February 1998) is a German athlete competing in the combined events. He won the gold medal in the decathlon at the 2019 World Championships, becoming the youngest ever decathlon world champion. In addition, he won gold medals at the 2022 European Championships, 2016 World U20 Championships and 2017 European U20 Championships.
Before concentrating on athletics, he played handball.
Outdoor
| +Individual events ! Event ! Performance ! Location ! Date | |||
| 100 metres | 11.20 | Wetzlar | 5 May 2018 |
| 200 metres | 22.16 | Neuwied | 1 July 2022 |
| 300 metres | 34.94 | Neuwied | 17 May 2025 |
| 400 metres | 48.09 | Friedberg | 28 April 2018 |
| 1500 metres | 5:13.83 | Berlin | 1 September 2024 |
| 110 metres hurdles | 14.17 | Mannheim | 20 May 2024 |
| Long jump | Frankfurt | 2 May 2021 | |
| High jump | Neuwied | 17 May 2025 | |
| Pole vault | Marburg | 13 August 2023 | |
| Shot put | Heidesheim am Rhein | 6 April 2019 | |
| Discus throw | Neuwied | 17 May 2025 | |
| Javelin throw | Berlin | 1 September 2019 |
| +Combined events ! Event ! Performance ! Location ! Date ! Score | ||||
| Decathlon | Doha | 3–4 October 2019 | 8,691 points | |
| 100 metres | 11.12 | Götzis | 31 May 2025 | 834 points |
| Long jump | Stadio Olimpico | 10 June 2024 | 920 points | |
| Shot put | Gävle | 13 July 2019 | 801 points | |
| High jump | Tokyo | 4 August 2021 | 906 points | |
| 400 metres | 47.87 | Munich | 15 August 2022 | 915 points |
| 110m hurdles | 14.27 | Hayward Field | 24 July 2022 | 940 points |
| Discus throw | Rome | 11 June 2024 | 868 points | |
| Pole vault | Doha | 3 October 2019 | 910 points | |
| Javelin throw | Doha | 4 October 2019 | 1,028 points | |
| 1500 metres | 4:10.04 | Munich | 16 August 2022 | 881 points |
| Virtual Best Performance | 9,003 points | |||
Indoor
| +Individual events ! Event ! Performance ! Location ! Date |
| 28 January 2024 |
| 2 February 2025 |
| 21 January 2018 |
| 21 February 2016 |
| 3 February 2019 |
| 2015 | World Youth Championships | Cali, Colombia | 2nd | Javelin throw | 78.05 m |
| 1st | Decathlon (youth) | 8002 pts | |||
| 2016 | World U20 Championships | Bydgoszcz, Poland | 1st | Decathlon (junior) | 8162 pts |
| 2017 | European U20 Championships | Grosseto, Italy | 1st | Decathlon (junior) | 8435 pts |
| 2018 | European Championships | Berlin, Germany | 4th | Decathlon | 8220 pts |
| 2019 | European U23 Championships | Gävle, Sweden | 1st | Decathlon | 8572 pts |
| World Championships | Doha, Qatar | 1st | Decathlon | 8691 pts | |
| 2021 | Olympic Games | Tokyo, Japan | – | Decathlon | DNF |
| 2022 | World Championships | Eugene, United States | 6th | Decathlon | 8434 pts |
| European Championships | Munich, Germany | 1st | Decathlon | 8545 pts | |
| 2023 | World Championships | Budapest, Hungary | — | Decathlon | DNF |
| 2024 | European Championships | Rome, Italy | 4th | Decathlon | 8547 pts |
| Olympic Games | Paris, France | 8th | Decathlon | 8445 pts | |
| 2025 | World Championships | Tokyo, Japan | 4th | Decathlon | 8538 pts |
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