Of Mice & Men (often abbreviated OM&M) is an American rock band formed in Costa Mesa, California, in 2009. The band's line-up currently consists of drummer Valentino Arteaga, guitarists Phil Manansala and Alan Ashby, and bassist and lead vocalist Aaron Pauley. The group was founded by former lead vocalist Austin Carlile and former bassist Jaxin Hall in mid-2009 after Carlile's departure from Attack Attack!. Carlile departed from the band in December 2016 citing that a long-term health condition prompted his exit. After Carlile's departure, the band continued to pursue creating music with Pauley as the band's bassist and lead vocalist.

Since 2009, the band has released nine studio albums: Of Mice & Men (2010), The Flood (2011), Restoring Force (2014), Cold World (2016), Defy (2018), Earthandsky (2019), Echo (2021), Tether (2023), and Another Miracle (2025). Of Mice & Men's earlier music has been described as metalcore and post-hardcore. Their later material has introduced more melodic notes and mixed in genres such as nu metal and alternative metal while retaining their original sound.

The band has played international music festivals including the Vans Warped Tour in 2010, 2011, 2012, 2014, and 2025 and the Soundwave Music Festival in 2013 and 2015.