This data set is a series of reflective diaries recorded as part of a project entitled "Investigating the challenges of online English Language instruction in the wake of the COVID-19 crisis". This project has the authority number of HE20-117 from the Human Research Ethics Committee (HREC) at the University of New England. Data collection was completed on the 4th of June 2021. The data set is comprised of a number of semi-structured reflective teaching diary entries. The reflective diary entries were gathered from a single active participant over the period of three teaching cycles. The reflective diaries entries have been entered into an NVivo file as they are currently being coded by the active members of the research team. These data will be analysed in order to derive themes in the reflective diaries that map the single participant's experiences teaching English language in a full online mode in the period after the COVID-19 pandemic. These data will support the research by enabling insight to be drawn around the challenges of online English language instruction in the wake of the COVID-19 crisis.