Background: Health care workers (HCWs) are at increased risk of influenza infection. Hence, the rationale for immunization to protect them and their patients particularly during the co-circulation of influenza and coronavirus disease 2019 (COVID-19). This study aims to assess knowledge, attitudes, and practices among HCWs towards the influenza vaccine and to identify the determinants of their willingness to vaccinate. Methods: Using an online survey, a cross-sectional study, was conducted in Lebanon between 14th and 28th October 2020 among HCWs. Descriptive statistics were reported using frequency and percentages for categorical variables. Multivariable logistic regression was carried out to identify the factors associated with influenza vaccine uptake. Adjusted odds ratio and their 95% confidence intervals were reported. Results: A total of 560 HCWs participated in the survey of which 72.9% were females. The majority were nurses (63.2%), married (66.1%) and aged between 30-49 years (53.9%). Nearly half of them had a good level of knowledge (≥80%). As perceived by HCWs, the availability of a sufficient quantity of vaccine will be the biggest challenge. Benefits of vaccination in enhancing patient safety, and avoiding co-infection by influenza and COVID-19 were well-acknowledged by HCWs. 32.1% of HCWs have received the influenza vaccine during the last year and 80.2% were willing to vaccinate for the current year. The influenza uptake was higher among HCWs who have received influenza vaccine in the past season (OR = 6.812, CI (3.045-15.239)), having a fair health status (OR = 3.117, CI (1.345-7.220)), good knowledge (OR=3.305, CI (1.155-9.457)), positive attitude (OR=2.305, CI (0.921-5.571)), low perception of barriers (OR= 4.130, CI (1.827-9.334)) and high perception of benefits (OR=6.264, CI (2.919-13.442) and was lower in single and divorced (OR=0.527, CI (0.284-0.978)). ConclusionAddressing misconceptions unveiled in this study through adapted training, along with economic interventions are needed to improve influenza vaccination coverage among HCWs.