1st meridian
# 1st meridian

1st meridian may refer to:

* 1st meridian east, a line of longitude east of the Greenwich Meridian
* 1st meridian west, a line of longitude west of the Greenwich Meridian
* First principal meridian in Ohio and Indiana, United States, 84°48'50" west of Greenwich
* Principal meridian of the Dominion Land Survey in Canada, 97°27′28.41″ west of Greenwich
* Counter Revolutionary Warfare Unit aka First Meridian Squadron, a former special forces unit in the Fijian military
