Most common delusions seen in schizophrenia are
Delusions of erotomania
Delusions of persecution
Delusions of grandiosity
Delusions of infidelity
Delusions of persecution are most common delusions in schizophrenia Bizarre delusions may also be seen in schizophrenia Ref: Essentials of postgraduate psychiatry By JN Vyas 1st ed Pg 398
Schizophrenia and other psychotic disorders