Andrea Collarini (Spanish pronunciation: [anˈdɾea kolaˈɾini]; born 31 January 1992) is an American-born Argentine professional tennis player. He has a career-high ATP singles ranking of No. 177 achieved on 24 April 2023 and a doubles ranking of No. 193 reached on 1 August 2022. He plays mostly on the ATP Challenger Tour, where he has won four titles in singles and three in doubles.

Collarini had represented Argentina in the early days of his career from 2007 to 2010, until he chose to represent United States from 2010 to 2012 before switching back to represent Argentina.

On the junior circuit, Collarini had a career high ITF junior ranking of world No. 5 achieved in 2009. In 2010, he reached the final of the French Open boys' singles event, finishing runner-up to Agustín Velotti.

He won his first ATP Challenger title at the 2015 Blu-Express.com Tennis Cup in the doubles event partnering Andrés Molteni.

Collarini made his ATP debut at the 2021 Croatia Open Umag as a qualifier but lost to wildcard Duje Ajduković.

Ranked No. 267, he qualified for the 2024 Generali Open Kitzbühel, his second ATP main draw but lost to wildcard Nicolas Moreno de Alboran.

In March 2026, during a Challenger tournament in Santiago, Chile, Collarini was involved in a viral incident after being seen spraying an aerosol on a tennis ball before serving. The moment, captured on video, quickly spread across social media and generated speculation among fans and commentators regarding a potential breach of tennis regulations.

The episode sparked debate on online platforms such as Reddit, where users questioned whether altering a ball could constitute a violation of the rules. According to tennis regulations, deliberately modifying a ball's condition—such as its weight or surface—is prohibited and could lead to penalties if done during official competition.