Boyd Calvin Tinsley (born May 16, 1964) is an American violinist and mandolinist who is best known for having been a member of the Dave Matthews Band.

He studied with Isidor Saslav, then concertmaster of the Baltimore Symphony Orchestra but, at age 16, decided he did not want to pursue a career in classical music.

[3] In 1991, Dave Matthews asked Tinsley to play violin on the song "Tripping Billies" with his band for their demo tape.

[4] Tinsley's other (co-) song-writing credits with the band include "41", "American Baby", "Everybody Wake Up (Our Finest Hour Arrives)", "Funny the Way It Is", "Pig", "Proudest Monkey", "Too Much", "Grux", "Shake Me Like a Monkey", "Lying in the Hands of God", "Why I Am", "Drunken Soldier", "Can't Stop", "Baby Blue", "Snow Outside", and "Idea of You".

[7] In October 2024, when the Dave Matthews Band was inducted into the Rock and Roll Hall of Fame, Tinsley was included as an inductee.

[8] On February 3, 2018, Tinsley announced that he was taking a leave of absence from the band, citing exhaustion and the need to focus on his health and family.

This latest individual that I am speaking of concocted this incredulous story of sexual harassment.”[16] In 2000, Tinsley made a guest appearance on The Getaway People's second album, Turnpike Diaries.

[17] In 2003, Tinsley released a solo album, True Reflections, featuring the title track he had written over a decade earlier.

[20][21] In August 2015, Tinsley formed the band Crystal Garden with Mycle Wastman, Charlie Csontos and Matt Frewen.

[26] Tinsley played in a celebrity doubles tennis match in 2007 with John McEnroe against Pete Sampras and Autria Godfrey.