Amy and Vicky Child Pornography Victim Restitution Improvement Act of 2015

Amends the federal criminal code to expand the definition of "full amount of the victim's losses" for purposes of provisions governing mandatory restitution of victims of offenses involving sexual exploitation and other abuse of children to include medical services, physical and occupational therapy or rehabilitation, and lost income for the victim's lifetime, as well as any losses suffered by the victim from any sexual act or conduct in preparation for or during the production of child pornography depicting the victim involved in the offense.

Sets forth guidelines for determining restitution where the victim of of a specified child pornography offense was harmed by one defendant (requiring restitution for not less than the full amount of the victim's losses) or by more than one defendant (requiring restitution for not more than the full amount of the victim's losses and not less than specified minimum amounts for certain offenses).

Requires joint and several liability where there are multiple defendants and allows each defendant who is ordered to pay restitution and who has made full payment to the victim equal to or exceeding the specified minimum amount to recover contribution from any other defendant ordered to pay. Sets forth contribution claim procedures.

Requires the Attorney General to report to Congress within one year after enactment of this Act on any progress of the Department of Justice in obtaining restitution for victims of such offenses.