Here, we report an observation of a Eurasian nuthatch Sitta europaea foraging with a tool in a public park in Greater London, UK. This record is of significance, as it provides the first photographic evidence (to our knowledge) of nuthatch tool use, reveals an unusually wide phylogenetic and geographic distribution of tool behaviour within the Sittidae, and constitutes a rare example of animal tool use in an urban environment. To improve our understanding of nuthatch tool behaviour, we are building a global database of relevant anecdotal field observations—submissions are most welcome.