The 2018 OFC Champions League knockout stage was played from 7 April to 20 May 2018. A total of eight teams competed in the knockout stage to decide the champions of the 2018 OFC Champions League.
The winners and runners-up of each of the four groups in the group stage advanced to the quarter-finals. <onlyinclude> </onlyinclude>
<onlyinclude> The eight teams in the knockout stage played on a single-elimination basis. In the quarter-finals, each tie was played as a single match, while in the semi-finals and final, each tie was played on a home-and-away two-legged basis.</onlyinclude>
The bracket was determined as follows:
<onlyinclude>The bracket was decided after the draw for the knockout stage (quarter-finals, semi-finals, and final) was held on 5 March 2018 at the OFC Headquarters in Auckland, New Zealand.
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The schedule of each round was as follows.
<onlyinclude> In the quarter-finals, the winners of one group played the runners-up of another group (teams from same group cannot play each other), with the group winners hosting the match, and the matchups decided by draw.
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<onlyinclude> In the semi-finals, the four quarter-final winners played in two ties, with the matchups and order of legs decided by draw.
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Lautoka won 2âÂÂ1 on aggregate.
2âÂÂ2 on aggregate. Team Wellington won on away goals.
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In the final, the two semi-final winners played each other, with the order of legs decided by draw.
Team Wellington won 10âÂÂ3 on aggregate.</onlyinclude>