4th meridian may refer to:
- 4th meridian east, a line of longitude east of the Greenwich Meridian
- 4th meridian west, a line of longitude west of the Greenwich Meridian
- The Fourth Principal Meridian in Illinois, United States, 90°27'11" west of Greenwich
- The Fourth Principal Extended Meridian in Minnesota and Wisconsin, United States, 90°25'37" west of Greenwich
- The Fourth Meridian of the Dominion Land Survey in Canada, 110° west of Greenwich
This disambiguation page lists articles associated with the title 4th meridian.If an internal link led you here, you may wish to change the link to point directly to the intended article. Category: