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Introduction: The “migrant” term indicates a resident born in a country other than the host country. Resident foreigners made up 8.4% of the total Italian population in 2020. The Sicilian trend reflects the national one, with 190,974 resident foreigners as of 1th January 2020. The aim of this study was to identify the presence of tumors in foreign patients residing in the RTI’s provinces of interest in 2003–2017 and to analyze the clinical-biological variables. Materials and Methods: We analyzed 3541 foreign patients with tumors (out of a total of 160,912 patients) residing in the RTI’s provinces of interest in 2003–2017. Foreign patients were identified by tax code. Tumors are described ((number and percentage). Results: Of the 3541 foreign patients, 36% were male and 64% were female. They resided in the provinces of Catania (42.6%), Messina (29.9%), Siracusa (20.7%), and Enna (6.6%). They came from Europe (57%), Africa (22.4%), the Americas (12.03%), Asia (5.08%), and Oceania (1.80%); 0.3% were stateless. The average age was 58 for males and 54.4 for females. The number of tumors (excluding non-melanoma skin tumors) was 3715. Sixty-two males and 98 females had one or more multiple tumors. In foreign females, the three most common tumors were breast (28%), thyroid (9%), and cervical (6%) tumors. Most breast cancers were diagnosed as stage T1 (35%) or T2 (26%). In foreign males, the three most common tumors were lung (13%), bladder (12%), and prostate (11%) tumors. Conclusions: The growing presence of foreign citizens in the provinces studied calls for more attention on oncology-related problems and more careful surveillance of changes in incidence and mortality by the RTI.