Seasonality of food refers to the times of year when a given type food is at its peak, either in terms of harvest or its flavour. This is usually the time when the item is the cheapest and the freshest on the market. The food's peak time in terms of harvest usually coincides with when its flavour is at its best. There are some exceptions; an example being sweet potatoes which are best eaten quite a while after harvest.

This page serves as a guide to the seasonality of food. The list below is for foods common in the Northern Hemisphere.

There has been considerable controversy about how far people should be encouraged to eat seasonal food. In 2008, the chef Gordon Ramsay attracted media coverage when he stated that restaurants should be fined for serving non-seasonal food. In September and October 2008, Valentine Warner presented a programme for BBC Two, entitled What to Eat Now, persuading people to consume seasonal food.