The list of ship decommissionings in 2005 includes a chronological list of all ships decommissioned in 2005.
| Operator | Ship | Flag | Class and type | Fate | Other notes | |
|---|---|---|---|---|---|---|
| 17 February | United States Navy | Detroit | Sacramento class Fast Combat Support Ship | Scrapped in 2006 | ||
| 15 March | United States Navy | Seattle | Sacramento class Fast Combat Support Ship | Scrapped in 2006 | ||
| 23 March | United States Navy | Spruance | Spruance class destroyer | Sunk as target | ||
| 31 March | Royal Navy | Norfolk | Type 23 frigate | Sold to Chile | ||
| 31 March | Royal Canadian Navy | Huron | Iroquois-class destroyer | Sunk as target | ||
| 29 June | United States Navy | Vincennes | Ticonderoga class cruiser | Mothballed | Possible future target ship | |
| 8 July | Royal Navy | Marlborough | Type 23 frigate | Sold to Chile | ||
| 14 July | Royal Navy | Cardiff | Type 42 (Batch 1) destroyer | Awaiting disposal | ||
| 3 August | Royal Navy | Invincible | Invincible class aircraft carrier | Mothball status | ||
| 3 August | Royal Norwegian Navy | Bergen | Oslo class frigate | In use as office facility | ||
| 8 August | Royal Navy | Leeds Castle | Castle class patrol vessel | Awaiting disposal | ||
| 19 August | United States Navy | O'Bannon | Spruance class destroyer | Transferred to reserve | Stored at Philadelphia Naval Shipyard in Philadelphia, Pennsylvania | |
| 15 September | United States Navy | Cushing | Spruance class destroyer | |||
| 27 September | Royal Navy | Brecon | Hunt class mine counter measures vessel | Awaiting disposal | ||
| 27 September | Royal Navy | Cottesmore | Hunt class mine counter measures vessel | Awaiting disposal | ||
| 27 September | Royal Navy | Dulverton | Hunt class mine counter measures vessel | Awaiting disposal | ||
| 13 October | United States Navy | Duluth | Austin class amphibious transport dock | |||
| 14 October | United States Navy | Camden | Sacramento class Fast Combat Support Ship | Undergoing Scrapping | ||
| 28 October | United States Navy | Belleau Wood | Tarawa class amphibious assault ship | Sunk as a target ship in 2006 | ||
| 12 November | Royal Australian Navy | Canberra | Adelaide class frigate | Awaiting conversion to dive wreck | ||
| 13 November | Royal New Zealand Navy | Wellington | Leander class frigate | Sunk as dive wreck, was decommissioned 1999 | formerly HMS Bacchante | |
| 14 December | United States Navy | Thomas S. Gates | Ticonderoga class cruiser |
| Ship events in 2005 | |||||||||||
| Ship launches: | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Ship commissionings: | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Ship decommissionings: | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |
| Shipwrecks: | 2000 | 2001 | 2002 | 2003 | 2004 | 2005 | 2006 | 2007 | 2008 | 2009 | 2010 |