Tiron (trade name; systematic name disodium 4,5-dihydroxy-1,3-benzenedisulfonate) is a chemical compound used for its ability to form strong complexes with titanium and iron.

Tirón River is a river in central-northern Spain in the provinces La Rioja, Burgos and Castile and León. Its length equals 65 kilometres. The source is located in Sierra de la Demanda. Tirón's longest tributary is Oja, while the river itself flows into Ebro River north east of Haro. In April 2015, anti-erosion work was established in Herramélluri; its worth is 221,000 euro.