This study is to determine the efficacy (how well the drug works), safety, and any side effects of olanzapine compared to placebo in the treatment of schizophrenia in adolescents. Both the potential benefits and side effects of olanzapine will be evaluated throughout this trial.

Inclusion Criteria:

• Are male or female patients, 13 to 17 years of age
• Patients must have a diagnosis of schizophrenia per DSM-IV-TR.
• Female patients of child-bearing potential must test negative for pregnancy at the time of enrollment.
• Both the patient and the patient's parent/authorized legal representative must understand the nature of the study and must sign a document granting consent.
• Patients must be capable of swallowing study medication whole (without crushing, dissolving, etc.)

Exclusion Criteria:

• Female patients who are either pregnant or nursing.
• Patients with acute or unstable medical conditions.
• Patients who have been judged clinically to be at serious suicidal risks.
• Patients who have previously not responded to an adequate dose and/or duration of olanzapine treatment.
• Patients who currently have delusional disorder, psychotic disorder NOS, schizophreniform, schizoaffective disorder, bipolar disorder, attention deficit/hyperactivity disorder or major depressive disorder.