2018 Davis Cup Asia/Oceania Zone Group III

The Asia/Oceania Zone was the unique zone within Group 3 of the regional Davis Cup competition in 2018. The zone's competition was held in round robin format in Hanoi, Vietnam, from 2 to 7 April 2018. The two winning nations won promotion to Group II, Asia/Oceania Zone, for 2019.

Participating nations
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•  (Host)

Draw
Date: 2–7 April, 2018

Location: Mỹ Đình Sports Complex, Hanoi, Vietnam (indoor hard)

Format: Round-robin basis. One pool of 4 teams (Pool A) and one pool of 5 teams (Pool B). The winner of Pool A will play-off against the runner-up of Pool B and the winner of Pool B will play-off against the runner-up of Pool A to determine which two nations will be promoted to Asia/Oceania Zone Group II in 2019.

Seeding

 * 1 Davis Cup Rankings as of 5 February 2018

Pool B
''Standings are determined by: 1. number of wins; 2. number of matches; 3. in two-team ties, head-to-head records; 4. in three-team ties, (a) percentage of sets won (head-to-head records if two teams remain tied), then (b) percentage of games won (head-to-head records if two teams remain tied), then (c) Davis Cup rankings.''

Playoffs

 * ' and ' promoted to Group II in 2019.
 * ' and ' relegated to Group IV in 2019.