The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 2018.
In the Asia/Oceania Zone there were four different tiers, called groups, in which teams competed against each other to advance to the upper tier. Winners in Group II advanced to the Asia/Oceania Zone Group I. Teams who lost their respective ties competed in the relegation play-offs, with winning teams remaining in Group II, whereas teams who lost their play-offs were relegated to the Asia/Oceania Zone Group III in 2019.
Seeds:  | Remaining nations:  | 
| Play-offs | First Round | Second Round | Third Round | |||||||||||||||
| Colombo, Sri Lanka (clay) [1] | ||||||||||||||||||
| 1 | 3 | |||||||||||||||||
| Colombo, Sri Lanka (clay) [2] | 2 | Manila, Philippines (indoor clay) [3] | ||||||||||||||||
| 1 | 1 | 4 | ||||||||||||||||
| 3 | Jakarta, Indonesia (indoor hard) [4] | 3 | 1 | |||||||||||||||
| 3 | 4 | |||||||||||||||||
| 1 | Nonthaburi, Thailand (hard) [5] | |||||||||||||||||
| 1 | 2 | |||||||||||||||||
| Causeway Bay, Hong Kong (hard) [6] | 3 | |||||||||||||||||
| 0 | ||||||||||||||||||
| Taipei, Taiwan (indoor hard) [7] | 4 | 4 | Zouk Mosbeh, Lebanon (hard) [8] | |||||||||||||||
| 0 | 4 | 1 | ||||||||||||||||
| 2 | 4 | Beirut, Lebanon (indoor hard) [9] | 3 | |||||||||||||||
| 3 | ||||||||||||||||||
| 2 | 2 | |||||||||||||||||
Sri Lanka 2  |  Sri Lanka Tennis Association, Colombo, Sri Lanka  [1]  3–4 February Clay  | Thailand 3  | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Indonesia 1  |  Gelora Bung Karno Sports Complex, Jakarta, Indonesia  [4]  3–4 February Hard (outdoor)  | Philippines 4  | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Hong Kong 4  |  Victoria Park Tennis Stadium, Causeway Bay, Hong Kong  [6]  3–4 February Hard  | Iran 0  | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Lebanon 3  | Taadod Sports Academy, Beirut, Lebanon  [9]  3–4 February Hard (indoor)  | Chinese Taipei 2  | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
  | |||||||||||||||||||||||||||||||||||||||||||||||
Philippines 1  | Philippine Columbian Association, Manila, Philippines  [3]  7–8 April Clay (i)  | Thailand 4  | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Lebanon 3  |  Notre Dame University – Louaize, Zouk Mosbeh, Lebanon  [8]  7–8 April Hard  | Hong Kong 1  | |||||||||||||||||||||||||||||||||||||||||||||
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Sri Lanka 1  |  Sri Lanka Tennis Association, Colombo, Sri Lanka  [2]  7–8 April Clay  | Indonesia 3  | |||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Chinese Taipei 4  | Taipei Tennis Center, Taipei, Taiwan  [7]  7–8 April Hard (i)  | Iran 0  | |||||||||||||||||||||||||||||||||||||||||||||
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Thailand 2  | The National Tennis Development Center (LTAT), Nonthaburi, Thailand  [5]  15–16 September Hard  | Lebanon 3  | |||||||||||||||||||||||||||||||||||||||||||||
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The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 2001.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 2000.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1999.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1998.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1997.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1996.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1995.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1994.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 2016.
The 2018 Davis Cup was the 107th edition of the Davis Cup, a tournament between national teams in men's tennis. It was sponsored by BNP Paribas. In 2018, new rules were introduced for the Group I and II zonal events, with ties now being played as best-of-three sets over the course of two days.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1988.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1989.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1990.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1991.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1992.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1993.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1997.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1998.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 1999.
The Asia/Oceania Zone was one of the three zones of the regional Davis Cup competition in 2000.