543 (disambiguation)

543 was a year.

543 may also refer to:
 * 543 (number)
 * 543 BC
 * List of United States Supreme Court cases, volume 543
 * List of highways numbered 543
 * List of state leaders in 543
 * 543 Charlotte
 * Unit 543
 * Area code 543
 * The 5-4-3 rule for configuring Ethernet networks