The world is currently witnessing an unprecedented crisis of the Covid-19 pandemic. The pandemic has caused severe devastation globally and the crumbling of health infrastructures in developing countries. 1,2 The Covid-19 is associated with significant morbidity and mortality due to its severe effects on the respiratory system and other organ systems, especially in those with comorbid conditions. 3,4 In addition to comorbidities, several other risk factors, such as female sex, lack of Covid-19 appropriate behavior, large households, BCG vaccination, etc., are presumed to play a role in the Covid-19-related morbidity and mortality. [5][6][7][8] One such risk factor which has been postulated to contribute to either acquisition or progression of Covid-19 is Vitamin D deficiency (VDD). 9Since the onset of the Covid-19 pandemic, the role of VDD has been a topic of intense research. 10 Several studies have reported low serum levels in patients with Covid-19, especially those with severe disease, and in those who died of Covid-19. 10 The recent meta-analysis also concluded that patients with VDD had an increased risk of developing the severe disease but not a fatal outcome. 10 The studies conducted on the association between VDD and Covid-19 show a large degree of heterogeneity due to the differences in enrolment criteria of patients (age, body mass index, ethnicity, comorbidities), the country of residence, and the criteria used to define the severity of Covid-19. 10 Another similar meta-analysis concluded that the evidence for VDD's association with ICU admission, inflammation, hospitalization, and pulmonary involvement in Covid-19, is still inconsistent and insufficient. 11 Furthermore, the impact of VDD on other outcome factors such as length of hospitalization and prognosis remains uncertain. 12 More research is thus warranted to formulate concrete recommendations regarding VDD and Covid-19.To guide further research, an assessment of the research conducted so far is essential. It helps in identifying the research gaps and the hotspots that the researchers need to focus on further. Such an assessment of previous research on any topic is often achieved through bibliometric studies. 13,14 The bibliometric studies also help identify major research contributors such as leading authors, organizations, and countries that facilitate more meaningful collaborations. 15 The previous bibliometric studies on Covid-19 did not evaluate the effects of VDD separately. 16,17 Furthermore, the mapping studies on worldwide research on vitamin D were conducted prior to the Covid-19 pandemic. [18][19][20] Thus, there is no bibliometric