As humans’ view of the world expanded from local to global, nature-minded observers became increasingly more aware that significant changes in climate, namely long lasting shifts in normal weather conditions, are connected over large distances. This view solidified when the collection of weather observations became routine. Often we find that drier and warmer than normal conditions in one geographical region are synchronized with opposite phase changes in regions that are thousands of kilometers away. In other cases, contemporaneous, in-phase changes occur over significant segments of the globe and have a common link to a third remote region where the perturbation originates. These almost global patterns are referred to in the scientific literature as “teleconnections”. They are a manifestation of the way energy is dispersed and transferred in the climate system (primarily by the atmosphere but also in the oceans) in response to a perturbation of internal origin of external forcing. This lecture will present the concept of teleconnections by discussing a few examples that play a significant role in today’s climate and might have been responsible to climate upheavals in the past.