Rikuto Yokoyama (横山 陸人, Yokoyama Rikuto, born 5 August 2001) is a Japanese professional baseball pitcher for the Chiba Lotte Marines of Nippon Professional Baseball (NPB).

Yokoyama was selected by the Chiba Lotte Marines in the 2019 Nippon Professional Baseball draft.

In 2023, he played 38 games, recording two wins, three losses, one save, 42 strikeouts and an ERA of 5.26.

In 2024, he played 43 games, finishing with a 3–1 record and three saves, posting an ERA of 1.71.

[3] Yokoyama was part of the Japanese team that won the 2023 Asia Professional Baseball Championship.