| George M Dawson Secondary, now called Gudangaay Tlaats'gaa Naay Secondary School | |
| Address: | PO Box 208, 1647 Collison Ave. |
| City: | Masset |
| Province: | British Columbia |
| Postcode: | V0T 1M0 |
| Country: | Canada |
| Coordinates: | 54.0114°N -132.1447°W |
| Schooltype: | high school |
| Fundingtype: | Public |
| Schoolboard: | School District 50 Haida Gwaii/Queen Charlotte |
| Number: | 5050001 |
| Principal: | Ian Keir |
| Staff: | 17 |
| Grades Label: | Grades |
| Grades: | 8–12 |
| Enrollment: | 69 |
| Enrollment As Of: | September 30, 2022 |
| Language: | English / Haida |
| Area: | Masset |
| Team Name: | GMD Thunder (Basketball) |
George Mercer Dawson Secondary, now called Gudangaay Tlaats'gaa Naay Secondary School is a public high school in Masset, British Columbia. It is one of three secondary schools and one of six schools in School District 50 Haida Gwaii/Queen Charlotte. Gudangaay Tlaats'gaa Naay Secondary School, officially opened on October 19, 1970, and was named after George Mercer Dawson, (August 1, 1849 – March 2, 1901) a Canadian scientist, surveyor and eminent authority on ethnology and archeology who undertook the Canadian Governments Geological Survey of Haida Gwaii.Having grown up in Old Massett (aka Haida) some internationally renowned Haida Artists such as Robert Davidson, Reginald Davidson and Jim Hart have all attended Gudangaay Tlaats'gaa Naay Secondary School.