Blinding: Titles and abstracts were independently examined by two blinded reviewers to determine their eligibility. After blinding, a textual analysis was performed, with others three independent reviewers addressing any discrepancies. Sampling Plan: We included quantitative and qualitative observational studies that evaluated individuals aged 18 years or older with OSCC and utilized questionnaires, whether validated or not, to conduct a descriptive assessment of dietary patterns. Explanation of Existing Data: Different studies utilize various methods to categorize the same food groups. To understand the relationship between the consumption patterns of each group and OSCC compared to the control group, we analyzed individual consumption per study and by frequency of consumption. This approach allowed us to determine the frequency of consumption for each food analyzed in both the OSCC and control groups. An average frequency was then calculated to discern the eating patterns by food groups between patients with OSCC and the control group. Finally, individual assessments of OSCC patients' eating patterns were conducted to identify the most and least frequently consumed food types. Data Collection Procedures: Searches were conducted in four electronic databases—MEDLINE, Embase, Web of Science, and Lilacs—without any restrictions on date or language. Studies were evaluated for eligibility, extracted, and compiled in a narrative format. Additionally, the reference lists of the included studies were hand-searched. The final search was performed in March 2024. Descriptors were identified using Medical Subject Headings (MeSH), Descritores em Ciências da Saúde (DeCS), and Embase Subject Headings (Emtree). These were then combined using the Boolean operator AND, while their synonyms were combined using the Boolean operator OR. The search strategy was adapted for each database based on the descriptors used. The PCC acronym (P - Population; C - Concept; C - Context) was employed to formulate the central research question: "What are the different associations of this type of cancer with diet?". Studies identified through electronic database searches were exported in "ris" format to the Rayyan Qatar Computing Research Institute application for systematic reviews. Data extraction was performed using Excel® 2013, the mean and standard deviation (SD) were also calculated where applicable. Data Exclusion: Reviews, preclinical studies, interventional studies, ecological studies, cost-effectiveness analyses, letters, and editorials were excluded, as well as studies involving pregnant or lactating women, children, adolescents, and individuals with chronic supplementation or the use of carcinogenic herbs (e.g., areca nut derivatives and betel quid), alcohol, or tobacco. Missing Data: Studies that did not present the required variables were excluded. Description: This study aimed to deepen the evidence on OSCC and diet through a scoping review, mapping the existing literature on the relationship between diet and OSCC, and conducting a detailed descriptive analysis of the findings to identify research gaps on this topic.