Stanley Toshi Matsunaka (born November 12, 1953) is a former Democratic member of the Colorado State Senate, serving from 1995 to 2003.

He graduated from Fort Morgan High School in 1971 then received a Bachelors of Science in biological sciences from Colorado State University in 1975 and a Juris Doctor from the University of San Diego in 1979.

[1] In 2002, Matsunaka ran against fellow state senator Musgrave for the open seat in the 4th District, which includes the cities of Greeley, Loveland, Longmont, and Fort Collins, as well much of the Colorado Eastern Plains; he lost to Musgrave 42%-55%.

In 2004, he again challenged Musgrave, now the incumbent, who had attracted controversy in the district for her sponsorship of the Federal Marriage Amendment.

Now an attorney in private practice in Loveland, Matsunaka was an advisor to Ed Perlmutter's successful 2006 campaign for Colorado's 7th congressional district.