MARPOL 73/78 is the International Convention for
the Prevention of Pollution from Ships, 1973 as modified by the Protocol of 1978. ("MARPOL" is short for marine pollution and 73/78 short for the years 1973 and 1978.)
MARPOL 73/78 is one of the most important international marine environmental
conventions. It was developed by the International Maritime Organization in an effort to minimize pollution of the oceans and seas, including dumping, oil and air pollution. The objective of this
convention is to preserve the marine environment in an attempt to completely eliminate pollution by oil and other harmful substances and to minimize accidental spillage of such substances.
The original MARPOL was signed on 17 February 1973, but did not come into force at the signing date. The current convention is a combination of 1973 Convention and the 1978 Protocol. It entered into force on 2 October 1983. As of April 2016, 154 states, representing 98.7 per cent of the world's shipping tonnage, are state parties to the convention.
All ships flagged under countries that are signatories to MARPOL are subject to its requirements, regardless of where they sail and member nations are responsible for vessels registered under their respective nationalities.
List of the MARPOL 73/78 Annexes
| Annex | Title | Entry into force |
| Annex I | prevention of pollution by oil & oily water | 2 October 1983 |
| Annex II | control of pollution by noxious liquid substances in bulk | 6 April 1987 |
| Annex III | prevention of pollution by harmful substances carried by sea in packaged form |
1 July 1992 |
| Annex IV | pollution by sewage from ships | 27 September 2003 |
| Annex V | pollution by garbage from ships | 31 December 1988 |
| Annex VI | Prevention of air pollution from ships | 19 May 2005 |