Marsh Lake-Mount Lorne-Golden Horn (formerly Mount Lorne-Southern Lakes) is a territorial electoral district of Yukon that has been represented in the Yukon Legislative Assembly since 2011.
The riding was created in 2009 by merging most of the former districts of Mount Lorne and Southern Lakes. In accordance with the Yukon Electoral District Boundaries Act (2024), the district was split into Marsh Lake-Mount Lorne-Golden Horn and Southern Lakes for the 2025 Yukon general election.
Marsh Lake-Mount Lorne-Golden Horn includes the communities of Marsh Lake, Little Squanga, Mount Lorne, Golden Horn, the Carcross Cutoff area, Annie Lake Road, Lewes Lake, and the Robinson subdivision. The riding is part of the traditional territory of the Carcross/Tagish First Nation, the Teslin Tlingit Council, and the Kwanlin Dün First Nation.
It is bordered by the ridings of Riverdale North, Riverdale South, Copperbelt South, Porter Creek South, Southern Lakes, Kluane, and Lake Laberge. It is the smallest electoral district outside of Whitehorse.
|-
| Liberal | John Streicker | align="right"| 451 | align="right"| 38.5% | align="right"| +27.9% |-
| NDP | Kevin Barr | align="right"| 437 | align="right"| 37.3% | align="right"| -9.5%
|- ! align left colspan=3|Total ! align=right| 1172 ! align=right| 100.0% ! align=right| –