Coronavirus disease 2019 (COVID-19) originated in China in early March 2019. Saudi Food and Drug Authorityapproved the registration of the Pfizer-BioNTech COVID-19 vaccine in Saudi Arabia on December 10, 2020 and on May 10, 2021, Pfizer-BioNTech was given an authorized emergency use in 12 to 15 years old children. Saudi Arabia’s Ministry of Health started Pfizer-BioNTech COVID-19 vaccination for 12 to 18 years old on June 27, 2021. Here we have a case of 16-year-old female admitted to the medical ward diagnosed with acute inflammatory transverse myelitis after two weeks from second dose of the Pfizer-BioNTech COVID-19 vaccine. The diagnosis was based on normal laboratory workup but significant radiological findings. She was discharged after a full recovery.There are multiple cases of post-vaccine acute inflammatory transverse myelitisshared by medical journals, but due to lack of literature review for the teenager population, we think our case may be the first case of acute inflammatory transverse myelitis following second dose of Pfizer-BioNTech COVID-19 vaccine in this population.