Halothiobacillus
（重定向自Halothiobacillaceae）
Halothiobacillus is a genus of Proteobacteria. All species are obligate aerobic bacteria; they require oxygen to grow. They are also halophilic; they live in environments with high concentrations of salt, and are considered "extremophiles".
The members of this genus used to belong to Thiobacillus, before they were reclassified in 2000. They are now classified with the purple sulfur bacteria.