Allin was described as a popular player in the six years he spent with the club before returning to his native Devon in 2013.
A statement on Warwickshire's website read: "Everyone at Edgbaston is immensely saddened by the news that former Warwickshire fast bowler Tom Allin has died.
"Tom was an incredibly popular member of the professional squad during his six years with Warwickshire, and he made one first class and one List A appearance before returning to his native Devon at the end of the 2013 season.
"The thoughts of all at Warwickshire County Cricket Club are with Tom's family and friends, and we would ask that their privacy be respected during this difficult time."
The England and Wales Cricket Board wrote on Twitter: "We are sad to hear of the passing of Tom Allin. Our sympathies go to his family, friends and colleagues DevonCCC & WarwickshireCCC."
Mr Allin's death comes after the body of rising star Hobden was found in a property in Forres near Inverness on Saturday.
The 22-year-old, one of six fast bowlers chosen to take part in the Potential England Performance Programme this winter, had been celebrating the new year with friends.