Purpose: Healthcare in Australia generates around 7% of national carbon emissions, with 20-30% of the 40,000 tonnes of Victorian Health Service waste attributed to operating theatres. Minor anorectal procedures (MARPs) and colonoscopy are very commonly performed procedures. The primary aim of this study was to audit the physical waste generated by these procedures. The secondary aim was to identify strategies to reduce environmental and financial impacts of these procedures. Methods: Prospective, observational study conducted over a 12-month period at a single tertiary metropolitan hospital. Twenty-four procedures were included.. Waste was categorised according to type (clinical, non-clinical and sharps) and the average (kilograms) was calculated. Equipment and waste disposal costs were obtained from administrative services. State-wide statistics for MARPs and colonoscopy were obtained via publicly available MBS billing data. Results: Physical waste production for MARPs and colonoscopy averaged 4.462kg and 1.283kg, and waste disposal costs were $2.14 and $1.26 per case, respectively. Thus, per annum in Victoria MARPs generate roughly 36 tonnes while colonoscopy produces 240 tonnes of waste. 48.3% of waste produced from MARPs was associated with establishing a sterile field at a purchase cost of $84.29 per unit, representing roughly $14,000 and 750kg per year at our study site and $750,000 and 16 tonnes of waste statewide. 50% of waste disposal had clear errors in the disposal route between non-clinical and clinical waste. Doubling up the use of dual smoke-extraction and simple diathermy sets per case were identified as an area of further waste. Conclusion: MARPs and colonoscopy generate a large amount of waste resulting in significant environmental and financial costs. Strategies to reduce waste such as limiting drapes for the sterile field and improving waste segregation were identified.