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Prostate cancer staging is the process by which physicians categorize the risk of cancer having spread beyond the prostate, or equivalently, the probability of being cured with local therapies such as surgery or radiation. Once patients are placed in prognostic categories, this information can contribute to the selection of an optimal approach to treatment. Prostate cancer stage can be assessed by either clinical or pathological staging methods. Clinical staging usually occurs before the first treatment and tumour presence is determined through imaging and rectal examination, while pathological staging is done after treatment once a biopsy is performed or the prostate is removed by looking at the cell types within the sample. As with many other cancers, these are often grouped into four stages (I–IV). Another scheme that was used in the past was Whitmore Jewett staging, although TNM staging is more common in modern practice. In the United Kingdom the 5 tiered Cambridge Prognostic Group (CPG) is used, replacing a previous system that divided prostate cancer into three risk groups. and UICC 7th edition. Stage I disease is cancer that is found incidentally in a small part of the sample when prostate tissue was removed for other reasons, such as benign prostatic hypertrophy, and the cells closely resemble normal cells and the gland feels normal to the examining finger. In Stage II more of the prostate is involved and a lump can be felt within the gland. In Stage III, the tumor has spread through the prostatic capsule and the lump can be felt on the surface of the gland. In Stage IV disease, the tumor has invaded nearby structures, or has spread to lymph nodes or other organs. The Gleason Grading System is based on cellular content and tissue architecture from biopsies, which provides an estimate of the destructive potential and ultimate prognosis of the disease.

Usually, the grade of the cancer (how different the tissue is from normal tissue) is evaluated separately from the stage. For prostate cancer, cell morphology is graded based on the Gleason grading system. Of note, this system of describing tumors as "well ", "moderately ", and "poorly " differentiated based on Gleason score of 2–4, 5–6, and 7–10, respectively, persists in SEER and other databases but is generally outdated. In recent years pathologists rarely assign a tumor a grade less than 3, particularly in biopsy tissue.

Although it is no longer commonly used in practice, the Whitmore Jewett system (also known as ABCD rating) is similar to the TNM system and has approximately equivalent stages. This replaces an older system which used 3 risk groups (low, medium and high risk). The CPG score is decided by looking at the Grade Group or Gleason score, the prostate specific antigen (PSA) level, and the clinical tumor stage.

While TNM staging is important, systems based just on anatomic features are not well suited for deciding what treatment is best for a patient with prostate cancer, as there is still considerable heterogeneity of prognosis within the stage categories. A more refined prognosis can be established by consideration of prostate specific antigen, and grade (i. e. Gleason score in the Gleason grading system). For example, it is common to classify patients into high, intermediate and low risk groups on the basis of these three factors (TNM stage, PSA and Gleason score). There is no clear division between stage, which has historically described the anatomic extent of disease at diagnosis, and prognostic models that may include many features that contribute to clinical outcome. If treated, patients with low risk disease are usually treated with active surveillance, prostatectomy, or radiotherapy alone. Patients with intermediate risk disease are candidates for prostatectomy or radiotherapy and a short duration (less than 6 months) of hormonal ablation (medical castration using a gonadotropin releasing hormone analog). Although the role of surgery in these patients remains uncertain, those with high risk disease are usually treated with radiotherapy and a long duration of hormonal ablation. Many high risk patients are not cured by this treatment, and the search for better treatments in this group is a particularly pressing concern in prostate cancer research.