KBAS may refer to:

• Kaseman Beckman Advanced Strategies, a design and architecture firm based in Philadelphia, Pennsylvania, United States
• KBAS-TV, a defunct television station that operated from 1957 to 1961 in Ephrata, Washington, United States
• KBAS-LP, a low-power radio station (98.3 FM) licensed to Basin, Montana, United States
• Knobias, a financial information company based in Pleasantville, New York, United States, which trades under the ticker symbol KBAS

• Sulfur allotropes
• Sulfur bacteria (disambiguation)
• Sulfur bichloride
• Sulfur Black 1
• Sulfur bromide
• Sulfur Butterfly
• Sulfur butterfly (disambiguation)
• Sulfur carrier protein ThiS adenylyltransferase
• Sulfur chloride oxide
• Sulfur chloride pentafluoride
• Sulfur Chloride Pentafluoride
• Sulfur concrete
• Sulfur-containing amino acids
• Sulfur cosmos
• Sulfur-crested cockatoo
• Sulfur decafluoride
• Sulfur dibromide
• Sulfur dichloride dioxide
• Sulfur difluoride
• Sulfur difluoride dioxide
• Sulfur dioxygenase
• Sulfurhead Aulonocara
• Sulfur Hexafluoride
• Sulfuric acid poisoning
• Sulfuricurvum kujiense