Kazuto Iizawa (born 2 February 2001) is a Japanese middle-distance runner. He won the gold medal at the 2023 Asian Indoor Athletics Championships and 2025 Asian Athletics Championships over 1500 metres.
He won the Japanese Athletics Championships over 1500 metres for the first time in 2022, in Osaka.
In 2023, he set a new Asian indoor record for the indoor mile run in Boston, Massachusetts, with a time of 3:56.01. He won the gold medal in the 1500 meters at the 2023 Asian Indoor Athletics Championships in Kazhakstan, running 3:42.83.
He won the Japanese Athletics Championships over 1500 metres for the second time in 2024, in Nigata.
He won the gold medal in the 1500 meters at the 2025 Asian Athletics Championships in Gumi, South Korea, running 3:42.56.
He won the Japanese Athletics Championships over 1500 metres for the third time in Tokyo in July 2025. In September 2025, he competed at the 2025 World Championships in Tokyo, Japan, without advancing to the semi-finals.