Matthew is a name derived from the Hebrew name מַתִּתְיָהוּ (Matityahu, meaning Gift of God) via the Greek "Ματταθίας" (Mattathias) or "Ματθαῖος" (Matthaios) and the Latin Matthaeus. Matt is the common diminutive. In the works of Harry Turtledove, Matthew may refer to:

Characters known only as Matthew:

Matthew (Atlantis), an overseer and minor character in Liberating Atlantis.

Characters whose first name is Matthew:

Matthew Cunningham, fictional American soldier in The Man With the Iron Heart.
Matthew Perry, historical United States Navy Admiral referenced in a number of Turtledove works, most importantly Homeward Bound.
Matthew Quinn, fictional actor in Ruled Britannia.
Matthew Radcliffe, an Atlantean Assemblyman in The United States of Atlantis.

Characters known only as Matt:

Matt (Iron Heart), a maimed veteran and minor character in The Man With the Iron Heart.
Matt (sim), a sim and POV in "Freedom" in A Different Flesh.

Characters whose first name is Matthias:

Matthias Walbeck, a schoolchild and minor character in In the Presence of Mine Enemies.

Characters whose first name is Matt:

Matt Damon, currently active American actor referenced in Homeward Bound.
Matt Harrison, fictional American General, minor character in The Hot War: Bombs Away.
Matt Ward, fictional Confederate soldier and POV in Fort Pillow.

Places and things named for Matthew:

St. Matthews, South Carolina, an important setting in Southern Victory.