And beware organic yoghurts: while the O-word makes consumers perceive these as healthier and lower-calorie, the report found these to have 13g sugar per 100g - the second highest average sugar content after dessert yoghurts (16g sugar per 100g).
Researchers at the School of Food Science and Nutrition in the University of Leeds looked at nearly 900 yoghurts and yoghurt products, including many which are household favourites in Ireland.
Of 921 yoghurts available in United Kingdom supermarkets in October and November 2016, organic ones had an average sugar content of about 13.1g per 100g, the highest content excluding those sold specifically as desserts.
Researchers warn that customers may think they're making a healthy choice when choosing those organic yogurts, when in fact they're making an unhealthy decision.
"If we are talking about children's products, so 10.8 [g of sugar per 100g], then 5% less we are talking 10.2g/100g ... there is definite room for the industry to do more, and I know that they are doing it, but it is not enough", said Dr Bernadette Moore, first author of the research from the University of Leeds, adding that she was "shocked and surprised" by the levels of sugar the study revealed.
"It can be a great source of protein, calcium, and vitamin B12".
Writing in the journal BMJ Open, Moore and colleagues describe how they looked at nutritional data for 898 products by searching the online grocery websites of five major United Kingdom supermarkets.
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Natural sugar is the sugar naturally present in a food - in yoghurt (and other dairy products) it's mostly a type of sugar called lactose.
Dietary guidelines recommend low-fat and low-sugar dairy products.
Less than 10 percent of the yoghurt sold in major British supermarkets is low in sugar, meaning it contains less than 5g sugar per 100g.
Yoghurts do contain naturally occurring sugar, called lactose, but United Kingdom labeling laws do not require manufacturers to declare added sugars, the authors said.
Picking the organic yoghurt in the fancy packaging over the supermarket basics variety may feel good but it is unlikely to help your waistline.
The study comes amid a government-drive to encourage manufacturers to reduce sugar content in their products - including yoghurts - by 20% by 2020.