Background: To explore continuities and changes in gambling behaviour during the COVID-19 pandemic and the factors that influenced these among a sample of regular sports bettors., Methods: A longitudinal qualitative study using in-depth interviews. Sixteen sports bettors living in Britain took part in the first interviews in July-November 2020, and 13 in the follow-up interviews in March-September 2021., Results: Individual patterns of gambling were episodic: it was common for gambling to increase during some periods of the pandemic and to decrease during others, reflecting the dynamic and (often) challenging circumstances which people were living through at the time. Changes and continuities in gambling during the pandemic were influenced by a range of factors which we have grouped into two main themes relating to 'gambling and the sports landscape' and 'disruption to day-to-day life'. It was common for a constellation of factors to influence gambling behaviour rather than a single factor. These constellations of factors varied from person to person and at different times during the pandemic., Conclusions: Findings of the present study are consistent with earlier literature examining gambling careers before the advent of COVID-19 showing that gambling trajectories are non-linear. Our research suggests that 'typical' patterns of gambling behaviour (e.g. being episodic), and the broader known risk and protective factors within individuals, families, communities and societies have been amplified during the pandemic. Findings highlight the adaptability of the gambling industry to continue to reach consumers through product offerings and marketing even in a period of unprecedented restrictions on supply, and show the potential resulting harms of these actions among gamblers at risk of experiencing gambling problems. Taken together, findings from this study provide important new insights relevant to discussions about gambling regulation, and support calls for multifaceted and comprehensive policy, regulatory, and treatment approaches, to minimise gambling-related harms., Competing Interests: Declarations. Ethics approval and consent to participate: Ethical approval for this element of ‘The Betting and Gaming COVID-19 Impact Study’ [26] was granted by the University of Stirling’s General University Ethics Panel (ref: GUEP (19 20) 930). Competing interests: AB and CD worked on the current study funded by the Economic and Social Research Council. In 2018/19, NC, FD, GR and RP worked on one study funded by GambleAware, which examined the impact of gambling marketing/advertising on young people and vulnerable groups. In the last five years FD discloses grant funding for gambling-related projects from the Medical Research Council and the National Institute for Health and Care Research. FD has received payment from the University of Chester to participate in an online focus group to help develop an awareness raising intervention to increase knowledge of the marketing strategies used by the gambling industry to promote their products. In the last 5 years, CB has received funding for research relating to gambling from the Economic and Social Research Council, National Institute for Health and Care Research and the British Academy. In the last five years RP discloses grant funding for gambling-related projects from UKRI, the Medical Research Council and the National Institute for Health and Social Research. In the last five years CG discloses grant funding from gambling-related projects from the Economic and Social Research Council and National Institute for Health and Care Research. In the past five years GR has received research funding from the Economic and Social Research Council, the National Institute for Health Research, the Medical Research Council and the British Academy. GR has had travel and accommodation expenses paid by the UK Society for the Study of Addiction, the Howard League for Crime and Penal Reform (via the Gambling Commission), the University of Helsinki Centre for Research on Addiction, Control and Governance/ Finnish Ministry of Social Affairs and Health, the Australian Research Council, and the Institute for Gambling and Society (GLUG) at the University of Ruhr, Bochum. In the past 5 years, HW has been funded for gambling studies by the Economic and Social Research Council, National Institute for Health Research, Wellcome Trust, the Gambling Commission (including their regulatory settlement fund), Office of Health Disparities and Improvements/Public Health England; Greater London Authority; Greater Manchester Combined Authority; Blackburn with Darwen Local Authority and the Department of Digital Culture Media and Sport. In 2018/19, HW received funding from GambleAware for a project on gambling and suicide. HW declares consulting fees from the Institute of Public Health, Ireland and the National Institute for Economic and Social Research. HW declares payment for delivery of seminars from McGill University and from John Hopkins University. HW has been paid as an expert witness by Lambeth and Middlesborough Borough Councils; HW declares travel costs paid by Gambling Regulators European Forum, the Turkish Green Crescent Society, Alberta Gambling Research Institute and the REITOX Academy (administered through the Austrian National Public Health Institute). She served as Deputy Chair of the Advisory Board for Safer Gambling between 2015 and 2020, remunerated by the Gambling Commission; is a Member of the WHO panel on gambling (ongoing) and provided unpaid advice on research to GamCare for their Safer Gambling standard (until 2021). She runs a research consultancy for public and third sector bodies only. She has not, and does not, provide consultancy services to the gambling industry. In the last five years KH discloses grant funding from gambling-related projects from the Economic and Social Research Council and National Institute for Health and Care Research., (© 2024. The Author(s).)