- In an interview with Entertainment Weekly, Gustin stated that he has a Superman tattoo. It says "superman...I love him" in his mother's handwriting.
- Wrongly tweeted his phone number in October 2011 in grantgust twitter and caused 20 fans call him in 10 minutes. Changed phone number in 5 minutes through AT&T.
- He and his The Flash (2014) co-star John Wesley Shipp, who played Barry Allen in The Flash (1990), were both born in Norfolk, Virginia.
- He has played the same character (Barry Allen / The Flash) in six different television series: Arrow (2012), The Flash (2014), Vixen (2015), Supergirl (2015), DC's Legends of Tomorrow (2016) and Batwoman (2019).
- He is of English, along with some German, Irish, and Welsh, and more distant Jersey/Channel Islander, ancestry. His paternal grandfather and great-grandfather were born in Canada, but many of Grant's family lines have been in the United States since the 1600s. His surname, Gustin, originates on the Isle of Jersey.
- Grant and his wife Andrea have 3 dogs, Nora, Rookie, and Jett.
- In January 2016, Gustin began dating Andrea "LA" Thoma. The couple announced their engagement on April 29, 2017.[19] They married on December 15, 2018. On February 11, 2021, the couple announced that they were expecting their first child.
- Wife La Thoma Gustin gave birth to a baby girl named Juniper Grace Louise on August 17, 2021.
- He has been married to La Thoma Gustin since December 15th, 2018.
- April 2, 2019 - Was caught vaping in a bathroom on a Compass Airlines flight from Los Angeles to Vancouver which caused smoke alarms to go off. Once he landed in Vancouver, authorities gave Gustin a warning.
- Has an older brother named Tyler and a younger sister named Gracie.
- Was a relationship with Hannah Douglass in the mid 2010s.
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