OIS

OIS may refer to:

• Object Oriented Input System, a cross-platform input system
• Objective Interface Systems, a communications software and hardware company
• Optical IP Switching, a computer optical network architecture
• Optical image stabilization, a technique to reduce motion-related blurring by an imaging system

• Oxford International School (Panama), an international school in Panama City, Panama
• Oeiras International School, an international school in Oeiras (suburb of Lisbon), Portugal
• Oulu International School, an international school in Oulu, Finland
• Organised Independents (OIs), an interest group within the National Union of Students (UK)
• Oberoi International School, an international school in Mumbai, India
• Oslo International School, an international school in Oslo, Norway
• Orchlon school(Orchlon International School), an international school in Ulaanbaatar, Mongolia

• Ops in Surgery, The St George's Surgical Society, an academic society at St George's University
• Oncogene-Induced Senescence, a mechanism in cell biology
• Ocular ischemic syndrome, a medical condition which blocks arterial blood flow to the eye
• Oxygen isotope stages, alternating warm and cool periods in the Earth's paleoclimate
• Outbreak intensity score, a scale to rank tornado outbreaks

• Officer-involved shooting, an incident in which a police officer shoots at another person
• Örgryte IS, a Swedish sports club based in Gothenburg
• Overnight indexed swap, a type of interest rate swap
• Order of Ikhamanga, a South African cultural honour