45th parallel may refer to:
- 45th parallel north, a circle of latitude in the Northern Hemisphere
- 45th parallel south, a circle of latitude in the Southern Hemisphere
- 45th Parallel (organization), a nonprofit organization and chamber music ensemble based in Portland, Oregon
- The 45th Parallel, a student-run newspaper at Taft High 7-12, a high school in Lincoln City, Oregon
This disambiguation page lists articles associated with the title 45th parallel.
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