S29 may refer to:
Aircraft Blériot-SPAD S.29, a French sport biplane Saab 29 Tunnan, a Swedish fighter aircraft Short S.29 Stirling, a British heavy bomber Sikorsky S-29, an American biplane airliner
Rail and transit S29 (Long Island bus), United States S29 (ZVV), a regional railway line of the Zurich S-Bahn, Switzerland S29, an Aargau S-Bahn line, Switzerland Neppu Station, in Kuromatsunai, Suttsu District, Hokkaido, Japan
Roads County Route S29 (California) County Route S29 (Bergen County, New Jersey) Route 179 (Pennsylvania–New Jersey), partially numbered New Jersey Route S29 until 1953
Other uses 40S ribosomal protein S29 British NVC community S29, a swamps and tall-herb fens community in the British National Vegetation Classification system , a submarine of the Royal Navy S29: Do not empty into drains, a safety phrase Sulfur-29, an isotope of sulfur , a submarine of the United States Navy S29(star), a star orbiting the supermassive black hole Sagittarius A* at the centre of the galaxy