|Portrayed by Lee Thompson Young|
|Full Name:||Barold Frost|
|Cause of Death:||Car Accident|
|Organization:||Boston Police Department (BPD)|
|Significant Others:||Anna Farrell (ex-fiancee)|
|Relatives:|| Admiral Frost (father)|
Camille Frost (mother)
|Season/s:||1, 2, 3 and 4|
|First appearance:||See One. Do One. Teach One|
|Latest appearance:||You're Gonna Miss Me When I'm Gone|
Barry Frost went to an elite prep school and was among the only three black students. He had a crush on Detective Jane Rizzoli for a while.
Frost is the type of person that cringes at the sight of blood and dead bodies, making it seem to others around him that his position as a homicide detective, who has to investigate and see dead bodies often, is unsuitable for him. In the beginning of the series, he throws up at the sight of dismangled bodies, resulting in him being the subject of teasing among his colleagues. As the series progresses though, he has begun adjusting to it, with the help of his partners and Dr. Isles and some research that tells him that repeated exposure will eventually help him to get over it.
Frost has proven to be a very skilled fighter. He is also a computer and technology whiz, but is he is terrified of dead bodies and becomes ill at the sight of blood. This has caused many team members to enjoy a laugh at his expense whenever he feels the need to get away from a particularly gruesome corpse.