The 48-year-old has been named as the European Club Association (ECA) representative to the Uefa Professional Strategy Council, which is the organisation's main policy-making body.
The Gunners supremo will also take a seat on the ECA Executive Board as a result, and oversee processes which represent over 207 European sides, including 10 Premier League teams.
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ECA chairman Karl-Heinz Rummenigge welcomed Gazidis to the role, saying: "His experience and distinct football knowledge will add a lot of value to ECA and European club football as a whole."
Manchester United CEO David Gill recently stepped down from the ECA Executive Board, and Gazidis has taken the available spot.
Gazidis also maintains roles on the FA's Professional Game Board (PGB), the FA Council and on Fifa'ss Dispute Resolution Chamber.