The Asia/Oceania Zone was one of three zones of regional competition in the 2005 Davis Cup.
Group I edit
| Second-round play-offs | First-round play-offs | First Round | Second Round | |||||||||||||||
| Lahore, Pakistan (grass) | ||||||||||||||||||
| S |  Thailand | 2 | ||||||||||||||||
| Osaka, Japan (indoor carpet) |  Pakistan | 3 | Lahore, Pakistan (grass) | |||||||||||||||
| S | Thailand | 1 | Pakistan | 4 | ||||||||||||||
 Japan | 4 | Taoyuan, Taiwan (hard) | S |  Chinese Taipei | 1 | |||||||||||||
| S | Chinese Taipei | 3 | ||||||||||||||||
| Bangkok, Thailand (hard) | Japan | 2 | ||||||||||||||||
| S | Thailand | 4 | ||||||||||||||||
 Indonesia | 1 | Jakarta, Indonesia (hard) | ||||||||||||||||
| Indonesia | 2 | |||||||||||||||||
| Tianjin, China (hard) | S |  Uzbekistan | 3 | Jaipur, India (grass) | ||||||||||||||
| Indonesia | 1 | S | Uzbekistan | 0 | ||||||||||||||
| S |  China | 4 | New Delhi, India (grass) |  India | 5 | |||||||||||||
| India | 5 | |||||||||||||||||
| S | China | 0 | ||||||||||||||||
- Indonesia relegated to Group II in 2006.
- Pakistan and India advance to World Group play-off.
Group II edit
| Play-offs | First Round | Second Round | Third Round | |||||||||||||||
| Auckland, New Zealand (indoor hard) | ||||||||||||||||||
| S |  New Zealand | 4 | ||||||||||||||||
| Tehran, Iran (clay) |  Kazakhstan | 1 | Auckland, New Zealand (indoor hard) | |||||||||||||||
| Kazakhstan | 3 | S | New Zealand | 3 | ||||||||||||||
| S |  Iran | 2 | Tehran, Iran (clay) |  Kuwait | 2 | |||||||||||||
| S | Iran | 1 | ||||||||||||||||
| Kuwait | 4 | Auckland, New Zealand (indoor hard) | ||||||||||||||||
| S | New Zealand | 2 | ||||||||||||||||
| Lautoka, Fiji (hard) | S |  South Korea | 3 | |||||||||||||||
 Pacific Oceania | 3 | |||||||||||||||||
| Beirut, Lebanon (clay) | S |  Lebanon | 2 | Seoul, South Korea (hard) | ||||||||||||||
| S | Lebanon | 3 | Pacific Oceania | 0 | ||||||||||||||
 Philippines | 2 | Manila, Philippines (indoor clay) | S | South Korea | 5 | |||||||||||||
| Philippines | 2 | |||||||||||||||||
| S | South Korea | 3 | ||||||||||||||||
- Iran and the Philippines relegated to Group III in 2004.
- South Korea promoted to Group I in 2004.
Group III edit
Venue: Victoria Park Tennis Centre, Causeway Bay, Hong Kong (hard)
Date: 13–17 July
| Group A | HKG | MAS | KSA | TJK | |
| 1 |  Hong Kong (3–0)
|
3–0 | 3–0 | 3–0 | |
|---|---|---|---|---|---|
| 2 |  Malaysia (2–1)
|
0–3 | 2–1 | 3–0 | |
| 3 |  Saudi Arabia (1–2)
|
0–3 | 1–2 | 2–1 | |
| 4 |  Tajikistan (0–3)
|
0–3 | 0–3 | 1–2 |
| Group B | VIE | SRI | BRN | QAT | |
| 1 |  Vietnam (3–0)
|
2–1 | 2–1 | 3–0 | |
|---|---|---|---|---|---|
| 2 |  Sri Lanka (2–1)
|
1–2 | 3–0 | 3–0 | |
| 3 |  Bahrain (1–2)
|
1–2 | 0–3 | 2–1 | |
| 4 |  Qatar (0–3)
|
0–3 | 0–3 | 1–2 |
(scores in italics carried over from Groups)
| 1st–4th Play-off | HKG | MAS | VIE | SRI | |
| 1 | Hong Kong (3–0)
|
3–0 | 3–0 | 3–0 | |
|---|---|---|---|---|---|
| 2 | Malaysia (2–1)
|
0–3 | 3–0 | 3–0 | |
| 3 | Vietnam (1–2)
|
0–3 | 0–3 | 2–1 | |
| 4 | Sri Lanka (0–3)
|
0–3 | 0–3 | 1–2 |
| 5th–8th Play-off | BRN | KSA | QAT | TJK | |
| 1 | Bahrain (2–1)
|
2–1 | 2–1 | 1–2 | |
|---|---|---|---|---|---|
| 2 | Saudi Arabia (2–1)
|
1–2 | 2–1 | 2–1 | |
| 3 | Qatar (1–2)
|
1–2 | 1–2 | 2–1 | |
| 4 | Tajikistan (1–2)
|
2–1 | 1–2 | 1–2 |
- Hong Kong and Malaysia promoted to Group II in 2006.
- Qatar and Tajikistan relegated to Group IV in 2006.
Group IV edit
Venue: Thein Byu Tennis Club, Yangon, Myanmar (hard)
Date: Week of 25 April
| Pool A | BAN | UAE | SYR | KGZ | TKM | |
| 1 |  Bangladesh (4–0)
|
2–1 | 2–1 | 3–0 | 2–1 | |
|---|---|---|---|---|---|---|
| 2 |  United Arab Emirates (3–1)
|
1–2 | 2–1 | 2–1 | 3–0 | |
| 3 |  Syria (2–2)
|
1–2 | 1–2 | 3–0 | 3–0 | |
| 4 |  Kyrgyzstan (1–3)
|
0–3 | 1–2 | 0–3 | 3–0 | |
| 5 |  Turkmenistan (0–4)
|
1–2 | 0–3 | 0–3 | 0–3 |
| Pool B | SIN | OMA | MYA | JOR | IRQ | |
| 1 |  Singapore (4–0)
|
2–1 | 3–0 | 2–1 | 3–0 | |
|---|---|---|---|---|---|---|
| 2 |  Oman (3–1)
|
1–2 | 3–0 | 3–0 | 3–0 | |
| 3 |  Myanmar (2–2)
|
0–3 | 0–3 | 3–0 | 3–0 | |
| 4 |  Jordan (1–3)
|
1–2 | 0–3 | 0–3 | 3–0 | |
| 5 |  Iraq (0–4)
|
0–3 | 0–3 | 0–3 | 0–3 |
- Bangladesh and Singapore promoted to Group III in 2006.