Senjak (Serbian: Сењак, pronounced [sêɲaːk]) is an urban neighborhood of Belgrade, the capital city of Serbia. Located in Savski Venac, one of the three municipalities that constitute the very center of the city, it is an affluent and distinguished neighborhood lavished with embassies, diplomatic residences, and mansions. Senjak is generally considered one of the wealthiest parts of Belgrade.
Before it became interesting to Belgrade's upper classes, Senjak was an excellent natural lookout. As many farmers kept their hay throughout the entire city, fires were quite frequent, so it was ordered for hay to be collected and kept in one place, and the area of modern Senjak was chosen, apparently also getting its name in the process (from the word seno, Serbian for hay). A more romantic theory of the neighborhood's name (from the word sena, Serbian for 'shade' or 'shadow') confronts the former theory.
Senjak originally belonged to the former municipality of Topčidersko Brdo, which in 1957 merged with the municipality of Zapadni Vračar to create the municipality of Savski Venac.