| Richard Marcellais | |
| State Senate: | North Dakota |
| State: | North Dakota |
| District: | 9th |
| Term Start: | 2007 |
| Term End: | 2022 |
| Succeeded: | Kent Weston |
| Party: | Democratic-NPL |
| Birth Date: | 23 January 1947 |
| Profession: | business management |
| Spouse: | Betty |
| Residence: | Belcourt, ND |
Richard Marcellais (born January 23, 1947) is a former North Dakota Democratic-NPL Party member of the North Dakota Senate, representing the 9th district.
In November 2008, Marcellais was voted in as the tribal chairman of the Turtle Mountain Band of Chippewa Indians. He ran for re-election in the 2010 election, but his candidacy did not survive during the tribe's primary election; he placed third. In the wake of this defeat, he ran for re-election for his Senate seat, defeating Republican candidate Christopher Albertson.