Background and Objectives: Halothermophilic bacteria are adapted to high osmolarity and can grow in high saline envi-ronments and high temperatures. This study was aimed at the isolation of halothermophilic bacteria from Howz-e Sultan HYPERSALINE lake in the central desert zone in Iran. Materials and Methods: Samples were collected and after preparing dilutions, the samples were cultured on Molten haloid agar with different salt concentrations (5-35%), then the plates were incubated at 35-70º C in both aerobic and anaerobic con-ditions. Biochemical characterizations, utilization of carbon sources, production of exoenzymes and antibiotic susceptibility were investigated. Taxonomic and phylogenetic analyses were performed using 16S rRNA gene sequences. Results: One of the isolated bacteria was found to be Gram-positive, hyperhalophilic, thermophilic, endospore-forming, and was named as 1-9 h isolate. The bacterial cells were bacilli-shaped, which produced endospores at a subterminal position. This isolate was an aerobe and facultative anaerobe and grew between pH 5. 0 and 10. 0 (optimal growth at pH 7. 0-7. 5), at temperature between 15° C and 65° C (optimal growth at 40-45° C) and at salinity of 9-32% (w/v) NaCl, growing optimally at 18% (w/v) NaCl. On the basis of 16S rRNA gene sequence analysis, isolate 1-9 h belongs to the genus Bacillus within the phylum Firmicutes and showed the closest phylogenetic similarity to Gracilibacillus sp. IBP-V003 (99. 0%). Conclusion: Based on the results of its phenotypic and genotypic properties, strain 1-9 h represents a novel strain of the genus Gracilibacillus. It can be used in various fields of industry and biotechnology.