The 2005 Men's World Water Polo Championship was the eleventh edition of the men's water polo tournament at the World Aquatics Championships, organised by the world governing body in aquatics, the FINA. The tournament was held in a temporary pool on Île Sainte-Hélène from 18 to 30 July 2005, and was incorporated into the 2005 World Aquatics Championships in Montréal, Canada.
Qualification
Participating teams
{| class=wikitable
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! width=15% | Africa
! width=15% | Americas
! width=15% | Asia
! width=20% | Europe
! width=15% | Oceania
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| <br> <br>
| <br>
| <br> <br> <br> <br> <br> <br> <br> <br>
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Groups formed
;Group A
;Group B
;Group C
;Group D
Preliminary round
{| class="wikitable"
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| width=10px bgcolor=aaffaa | || Qualified for the quarterfinals
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| width=10px bgcolor=ccffcc | || Qualified for the playoff round
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| width=10px | || Will play for places 13–16
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Group A
- Monday July 18, 2005
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! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 11 – 7
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| align=right |
| 7 – 5
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- Wednesday July 20, 2005
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! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 11 – 4
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| align=right |
| 5 – 4
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- Friday July 22, 2005
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! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 8 – 7
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| align=right |
| 15 – 4
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Group B
- Monday July 18, 2005
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! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 7 – 4
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| align=right |
| 21 – 1
| align=left |
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- Wednesday July 20, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 17 – 5
| align=left |
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| align=right |
| 13 – 6
| align=left |
|}
- Friday July 22, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 9 – 8
| align=left |
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| align=right |
| 8 – 4
| align=left |
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Group C
- Monday July 18, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 14 – 4
| align=left |
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| align=right |
| 19 – 4
| align=left |
|}
- Wednesday July 20, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 6 – 4
| align=left |
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| align=right |
| 11 – 3
| align=left |
|}
- Friday July 22, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 10 – 4
| align=left |
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| align=right |
| 10 – 2
| align=left |
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Group D
- Monday July 18, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 11 – 4
| align=left |
|-
| align=right |
| 9 – 8
| align=left |
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- Wednesday July 20, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
|-
| align=right |
| 8 – 4
| align=left |
|-
| align=right |
| 11 – 6
| align=left |
|}
- Friday July 22, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
|-
| align=right |
| 11 – 6
| align=left |
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| align=right |
| 10 – 8
| align=left |
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Final round
Finals
5th-8th place
9th-12th place
13th-16th place
Playoff round
- Sunday July 24, 2005
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! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 17 – 2
| align=left |
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| align=right |
| 6 – 5
| align=left |
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| align=right |
| 10 – 6
| align=left |
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| align=right |
| 7 – 5
| align=left |
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Classification round
- Sunday July 24, 2005 — 13th/16th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 8 – 13
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| align=right |
| 11 – 5
| align=left |
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- Tuesday July 26, 2005 — 9th/12th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 16 – 3
| align=left |
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| align=right |
| 5 – 3
| align=left |
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- Thursday July 28, 2005 — 5th/8th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 7 – 11
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| align=right |
| 7 – 4
| align=left |
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Quarter finals
- Tuesday July 26, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 6 – 4
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| align=right |
| 10 – 8
| align=left |
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| align=right |
| 8 – 4
| align=left |
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| align=right |
| 13 – 9
| align=left |
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Semi finals
- Thursday July 28, 2005
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 7 – 6
| align=left |
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| align=right |
| 5 – 4
| align=left |
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Finals
- Tuesday July 26, 2005 — 15th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 7 – 6
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- Tuesday July 26, 2005 — 13th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 10 – 8
| align=left |
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- Thursday July 28, 2005 — 11th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 6 – 10
| align=left |
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- Thursday July 28, 2005 — 9th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 5 – 11
| align=left |
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- Saturday July 30, 2005 — 7th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 7 – 6
| align=left |
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- Saturday July 30, 2005 — 5th place
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 7 – 8
| align=left |
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- Saturday July 30, 2005 — File:Med 3.png Bronze-medal match
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 11 – 10
| align=left |
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- Saturday July 30, 2005 — File:Med 1.png Gold-medal match
{| style="text-align:center"
! width=200 | !! width=100 | !! width=200 |
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| align=right |
| 8 – 7
| align=left |
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Final ranking
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| style="text-align:center;" | || style="white-space:nowrap;" |