Hidakasanmyaku-Erimo-Tokachi National Park (日高山脈襟裳十勝国立公園, Hidaka-sanmyaku-Erimo-Tokachi Kokuritsu-kōen) is a national park in south-central Hokkaido, Japan. Encompassing much of the Hidaka Mountains as well as Cape Erimo, it is the largest in the country by land area.

Erimo Prefectural Park was first established in 1950, before its redesignation as Erimo Prefectural Natural Park in 1958. On 1 October 1981, the park was elevated to the status of a quasi-national park and renamed Hidaka-sanmyaku Erimo Quasi-National Park (日高山脈襟裳国定公園). On 25 June 2024, the park was once again elevated in status and renamed Hidakasanmyaku-Erimo-Tokachi National Park. At the same time, the area designated for protection was increased from 1,034.47 square kilometres (399.41 sq mi) to 2,456.68 square kilometres (948.53 sq mi).

The park includes areas of:

• Biratori
• Erimo
• Hidaka
• Hiroo
• Memuro
• Nakasatsunai
• Niikappu
• Obihiro
• Samani
• Shimizu
• Shinhidaka
• Taiki
• Urakawa

• List of national parks of Japan