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A 35-year-old female with no medical history presented with fever. Laboratory work was normal except for elevated liver function test (LFT): alkaline phosphatase (AP) (296), aspartate transaminase (AST) (343), alanine transaminase (ALT) (378), and international normalized ratio (INR) (1.23). Ultrasound liver was normal. Infectious workup was negative for hepatitis A virus (HAV), hepatitis B virus (HBV), hepatitis C virus (HCV), hepatitis E virus (HEV), cytomegalovirus (CMV), Epstein-Barr virus (EBV), Herpes simplex virus (HSV), and COVID-19. Similarly, autoimmune hepatitis, Wilson, and alpha-1 antitrypsin workup were negative. She reported taking Yogi-Kanthika (ayurvedic-proprietary medicine) on/off for seasonal sore throat, yet RUCAM-score was 2 (unlikely a drug induced injury). Respiratory-viral-panel came positive for adenovirus. With supportive treatment, symptoms and LFT trended down, thus, liver biopsy decision was deferred. We believe this is the first reported case of adenovirus hepatitis in an immunocompetent adult. Hence, we suggest that clinicians should consider a refined differential diagnosis for elevated LFT (that includes adenovirus).