Garrett Lee Smith Memorial Act Reauthorization of 2015

Amends the Public Health Service Act to reauthorize and revise a research, training, and technical assistance resource center to prevent suicides (the Suicide Prevention Resource Center). Expands the program's focus from youth suicides to suicides among all ages, particularly among groups that are at high risk for suicide. Repeals authority for grants to establish research, training, and technical assistance centers related to mental health, substance abuse and the justice system.

Reauthorizes a program of grants for the development of state or tribal youth suicide early intervention and prevention strategies.

Reauthorizes and revises a grant program to enhance services for students with mental health or substance use disorders at institutions of higher education. Requires the Center for Mental Health Services to award grants to enhance such services and to develop best practices for the delivery of such services. Permits grant funds to be used for the provision of such services to students and to employ appropriately trained staff. Requires special consideration be given to applications for grants that describe programs that demonstrate the greatest need for new or additional mental and substance use disorder services and the greatest potential for replication.