Several wars involving Japan, both in OTL and Harry Turtledove timelines, include the term "Japanese War" in the name.

Hispano-Japanese War, a fictional war in Southern Victory.
Japanese War (Joe Steele), a fictional war in "Joe Steele"/Joe Steele.
Russo-Japanese War, an OTL war referenced in numerous timelines.
Second Russo-Japanese War, a fictional war in The War That Came Early.
Second Sino-Japanese War, an OTL war referenced in numerous timelines.
Soviet-Japanese Border Wars, an OTL series of wars referenced in numerous timelines.

In addition, certain phases of the Pacific theater of World War II might be called the Japanese War. Turtledove's fictional Pacific War (Southern Victory) and Asteroid Mining War ("La Différence") also fit such a description.

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