Colorectal carcinoma (CRC), also called large bowel cancer, is a malignant neoplasm of the mucosal lining of the colon, rectum, or both. Colorectal cancer has been investigated for decades and despite of the scientific effort or the fast-developing new medical technologies, this disease, which demonstrates a very complex and multifactorial set of causes in its development, remains an important cause of morbidity and mortality globally. In March 2020 the WHO declared the infection with SARS-Cov-2 and the related COVID-19 a pandemic with exponential increase of infection rates and fast spread throughout the whole world, quickly becoming a global health threat and at the same time impacting health care system on multiple levels. Countries adapted to the high numbers of COVID-19 patients in need of medical care with a shift of resources from other medical specialties towards the management and research of the viral disease. Governments in cooperation with various professional medical societies established public health and social measures (PHSM) in order to mitigate further spread and thereby decrease the pressure of the pandemic on the health care systems. However, medical care for cancer patients in general has been compromised by means of decreasing patients encounters in the primary sector, seizing of cancer screening, delays of diagnostic and therapeutic procedures, decreasing surgery volumes, etc. and by that potentially impacting the outcome, defined as overall survival (OS) and quality of life (QoL), of these patients. This graduate thesis outlines the current knowledge of colorectal carcinoma and analyzes the impact of the COVID-19 pandemic on the surgical treatment of patients with colorectal carcinoma (CRC) by presenting data from different regions with high prevalence of CRC in order to make a statement on whether and how the pandemic impacted the preoperative characteristics of patients (e.g. ASA-score and stage of cancer at time of treatment) and different parts of the treatment of CRC patients.