Aaro Soiniemi (born 8 August 2005) is a Finnish professional footballer, playing as a left back for HJK.
Soiniemi started to play football in a youth team of Nurmijärven Jalkapalloseura (NJS), before joining the renowned Käpylän Pallo (KäPa) youth academy when he was nine years old. He made his senior debut with KäPa first team in 2022 in Finnish third-tier league Kakkonen, and at the end of the season, KäPa won the promotion to second-tier Ykkönen.
On 14 November 2023, Soiniemi signed a three-year deal with Finnish champions HJK Helsinki. On 8 February 2024, Soiniemi was loaned out to second-tier Ykkösliiga club Turun Palloseura (TPS) for the 2024 season.
Soiniemi was part of the Finland U18 squad winning the friendly tournament Baltic Cup in June 2023.