Spark Masayuki Matsunaga (Japanese: 松永 正幸,[1] October 8, 1916 – April 15, 1990) was an American politician and attorney who served as United States Senator for Hawaii from 1977 until his death in 1990.

A member of the Democratic Party, Matsunaga introduced legislation that led to the creation of the United States Institute of Peace and to reparations to Japanese-American World War II detainees.

The training record of the 100th Infantry Battalion (Sep) at Camp McCoy, plus the service of the Varsity Victory Volunteers[6] in Hawaiʻi, led the War Department to authorize the formation of the 442nd Regimental Combat Team (RCT) on February 1, 1943.

That year, with Hiram Fong retiring, Matsunaga defeated Hawaii's other House representative, Patsy Mink, for the Democratic Party nomination for Senator.

[9] Matsunaga was instrumental in the passage of a redress bill for people of Japanese descent who were detained in the United States during World War II.

One famous incident involved Matsunaga and then-Secretary of State Alexander Haig at a White House reception for Japanese Prime Minister Zenko Suzuki in 1981.

Also in the papers are professional and personal materials from his pre-Congressional life; especially noteworthy are documents, letters, photographs, and memorabilia from his Army service in the 100th Infantry Battalion.

[11] A bronze statue honoring him is in the Spark M. Matsunaga International Children's Garden For Peace at the Storybook Theatre of Hawaii in his hometown of Hanapepe, Kauai.