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DSM-IV and DSM-IV-TR:

Delusional Disorder

This psychotic mental disorder is diagnosed when prominent non-bizarre delusions are presentfor at least one month and the symptom criteria for Schizophrenia have never been met. Hallucinations may be present, but auditory or visual hallucinations cannot be prominent. Olfactory or tactile hallucinations may be prominent, but only if they are related to the content of the delusion. Psychosocial functioning may not be impaired and any co-occurring mood episodes must be of relatively brief duration.

Diagnostic criteria for 297.1 Delusional Disorder

A. Nonbizarre delusions (i.e., involving situations that occur in real life, such as being followed, poisoned, infected, loved at a distance, or deceived by spouse or lover, or having a disease) of at least 1 month's duration.

B. Criterion A for Schizophrenia has never been met. Note: Tactile and olfactory hallucinations may be present in Delusional Disorder if they are related to the delusional theme.

C. Apart from the impact of the delusion(s) or its ramifications, functioning is not markedly impaired and behavior is not obviously odd or bizarre.

D. If mood episodes have occurred concurrently with delusions, their total duration has been brief relative to the duration of the delusional periods.

E. The disturbance is not due to the direct physiological effects of a substance (e.g. a drug of abuse, a medication) or a general medical condition.
Specify type (the following types are assigned based on the predominant delusional theme):
Erotomanic Type: delusions that another person, usually of higher status, is in love with the individual
Grandiose Type: delusions of inflated worth, power, knowledge, identity, or special relationship to a deity or famous person
Jealous Type: delusions that the individual's sexual partner is unfaithful
Persecutory Type: delusions that the person (or someone to whom the person is close) is being malevolently treated in some way
Somatic Type: delusions that the person has some physical defect or general medical condition
Mixed Type: delusions characteristic of more than one of the above types but no one theme predominates
Unspecified Type

Based on the Diagnostic & Statistical Manual of Mental Disorders, 4th edition APA

Also: Paranoid Disorder

The online Diagnostic & Statistical Manual of Mental Disorders lists most of the major psychological disorders and illnesses and lists the criteria that must be fulfilled in order for a diagnosis to be made. This resource is not a substitute for proper professional psychiatric diagnosis.