BTD (disambiguation)

BTD may refer to:
 * Back to December, A song by American singer-songwriter Taylor Swift from her 3rd studio album Speak Now.
 * BTD (Before the Dawn)
 * Bloons Tower Defense, the tower defense series by Ninja Kiwi.
 * Biotinidase, the enzyme that in humans is encoded by the BTD gene.
 * British trade dollar, a silver coin minted by Great Britain to facilitate trade with the Far East.
 * Douglas BTD Destroyer, 1940s American torpedo/dive-bomber.
 * Built to Destroy (Michael Schenker Group album), the fourth album by the Michael Schenker Group
 * Built to Destroy (Incite album), the fifth album by Incite