The 2014–15 UEFA Europa League knockout phase began on 19 February and concluded on 27 May 2015 with the final at Stadion Narodowy in Warsaw, Poland to decide the champions of the 2014–15 UEFA Europa League. A total of 32 teams competed in the knockout phase.
Times up to 28 March 2015 (round of 16) were CET (UTC+1), thereafter (quarter-finals and beyond) times were CEST (UTC+2).
All draws were held at UEFA headquarters in Nyon, Switzerland.
Matches may also be played on Tuesdays or Wednesdays instead of the regular Thursdays due to scheduling conflicts.
The knockout phase involved 32 teams: the 24 teams which qualified as winners and runners-up of each of the twelve groups in the group stage, and the eight third-placed teams from the Champions League group stage.
Each tie in the knockout phase, apart from the final, was played over two legs, with each team playing one leg at home. The team that scored more goals on aggregate over the two legs advanced to the next round. If the aggregate score was level, the away goals rule was applied, i.e. the team that scored more goals away from home over the two legs advanced. If away goals were also equal, then thirty minutes of extra time was played. The away goals rule was again applied after extra time, i.e. if there were goals scored during extra time and the aggregate score was still level, the visiting team advanced by virtue of more away goals scored. If no goals were scored during extra time, the tie was decided by penalty shoot-out. In the final, which was played as a single match, if scores were level at the end of normal time, extra time was played, followed by penalty shoot-out if scores remained tied.