Hoornaar

{{Infobox settlement | name = Hoornaar | settlement_type = Town | other_name = | native_name = | native_name_lang = nl | image_skyline = Hoornaarkerk.jpg | image_alt = | image_caption = Kerk | image_flag = | image_shield = | nickname = | motto = | image_map = LocatieGiessenlanden.png | map_caption = | image_map1 = Map NL - Giessenlanden - Hoornaar.png | map_caption1 = The town centre (dark green) and the statistical district (light green) of Hoornaar in the former municipality of Giessenlanden. | pushpin_map = | pushpin_label_position = | pushpin_map_caption = Location in the Netherlands | subdivision_type = Country | subdivision_name = Netherlands | subdivision_type1 = Province | subdivision_name1 = South Holland | subdivision_type2 = Municipality | subdivision_name2 = Molenlanden | leader_title = | leader_name = | leader_party = | coordinates = | coordinates_footnotes = | elevation_m = | elevation_min_m = | elevation_max_m = | area_footnotes = | area_total_km2 = | established_title = | established_date = | population_footnotes = <!-- for references: use The statistical area "Hoornaar", which also can include the peripheral parts of the village, as well as the surrounding countryside, has a population of around 1580.

Hoornaar was a separate municipality between 1817 and 1986, when it became part of Giessenlanden.