Ponds may hold significant stocks of organic carbon in their sedimentsand pond creation 22 may offer a practical application for land managers to increase carbon storage. However, ponds are 23 overlooked in global carbon budgets. Their potential significance is suggested by the abundance of 24 ponds throughout terrestrial biomes and their high carbon burial rates, but we lack measures of 25 sediment carbon stocks from typical ponds. We sampled sediment from lowland temperate ponds in 26 north east England comparing carbon stocks from ponds categorised by surrounding land use, or 27 dominant vegetation, or drying regime, along with measures of variation within ponds. Sediment 28 carbon varied considerably between ponds. This variation was more important than any systematic 29 variation between pond types grouped by land use, vegetation or drying, or any variation within an 30 individual pond. Our estimates of pond sediment organic carbon give measures that are higher than 31 from soils in widespread habitats such as temperate grassland and woodland, suggesting that ponds 32 are significant for carbon budgets in their own right. Ponds are relatively easy to create, are 33 ubiquitous throughout temperate biomes and can be fitted in amongst other land uses; our results 34 show that pond creation would be a useful and practical application to boost carbon sequestration 35 in temperate landscapes.