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Purpose: To assess the prognostic value of T category of the 8thedition of American Joint Committee on Cancer (AJCC) classification in periocular sebaceous gland carcinoma (SGC). Methods: Retrospective interventional case series of 119 cases. Results: Based on the T category of 8th edition of AJCC classification, 119 periocular SGCs were classified into T1 (n= 33, 28%), T2 (n= 37, 31%) T3 (n= 17, 14%) and T4 (n= 32, 27%). There were no statistically significant differences in the rate of tumour recurrence based on T category. The outcome measures that showed significant increase with increase in T category included regional lymph node metastasis (3% for T1, 3% for T2, 12% for T3, and 44% for T4; p< 0.0001), systemic metastasis (0% for T1, 0% for T2, 12% for T3, and 25% for T4; p= 0.002) and death due to metastasis (0% for T1, 0% for T2, 12% for T3, and 22% for T4; p= 0.005). The 5-year Kaplan-Meier estimate rate for regional lymph node metastasis, systemic metastasis and metastasis-related death were all higher for the T4 category tumours (42%, p= 0.005; 34%, p= 0.0002; and 43%, p= 0.0001 respectively) compared to T1 (9%, 0%, and 0%), T2 (5%, 0%, and 0%) and T3 (10%, 17 and 8%) tumours. Conclusion: Primary tumour (T) category of the 8thedition AJCC classification predicts the prognosis of patients with periocular SGC. The rates of lymph node metastasis, systemic metastasis, and death is much higher in T4 tumours compared to T1, T2, and T3 tumours. There was no association between T category and tumour recurrence.