Dennis Michael Richardson (July 30, 1949 – February 26, 2019) was an American attorney, businessman, and politician.
He served as the 26th Secretary of State of Oregon from 2017 until his death in 2019.
Richardson was from Central Point, Oregon and served six terms in the Oregon House of Representatives as a member of the Republican Party.
He represented House District 4, which included portions of Jackson and Josephine counties, and was the Republican nominee for Governor of Oregon in the 2014 election, losing to incumbent Democrat John Kitzhaber.
In 2016, Richardson was the successful Republican nominee for Oregon Secretary of State, defeating Democratic candidate Brad Avakian with 47% of the vote to Avakian's 43%.
On February 26, 2019, Richardson died following a battle with brain cancer.