| ISA | Identifier Splitting Algorithm 
| Others |
| ISA | Idle Speed Actuator
| Others |
| ISA | Illinois Science Assessment
| Others |
| ISA | In Shaa Allah (at Allah's will)
| Others |
| Isa | In Shaa' Allah (God willing)
| Others |
| ISA | Incline Start Assist
| Others |
| ISA | Income Share Account
| Others |
| ISA | Income Share Agreement
| Others |
| ISA | Independent Safeguarding Authority
| Others |
| ISA | Independent Safety Assessor
| Others |
| ISA | Independent Savings Account
| Others |
| ISA | Independent Spiritualist Association
| Others |
| ISA | Independent Stations Algorithm
| Others |
| ISA | Indian Society of Anaesthesiologists
| Others |
| ISA | Indian Student Association
| Others |
| ISA | Individual Savings Account
| Others |
| ISA | Individual Savings Accounts
| Others |
| ISA | Industrial Security Annex
| Others |
| ISA | Industrial Services of America
| Others |
| ISA | Industrial Supply Association
| Others |
| ISA | Industry Standard Architecture
| Others |
| ISA | Industry Sub-sector Analysis
| Others |
| ISA | Information Science Abstract
| Others |
| ISA | Information Security and Assurance
| Others |
| ISA | Information Security Auditor
| Others |
| ISA | Information Sharing Agreement
| Others |
| ISA | Information Sharing and Assessment
| Others |
| ISA | Information Sharing Assessment
| Others |
| ISA | Information Systems Architecture
| Others |
| ISA | Informix Server Administrator
| Others |
| ISA | Informix System Administrator
| Others |
| ISA | Initial Sun Acquisition
| Others |
| ISA | Innovative Slot Allocation
| Others |
| ISA | Input Signal Amplifier
| Others |
| ISA | Inside Sales Advisor
| Others |
| ISA | Inside Surface of Assembly
| Others |
| ISA | Instantaneous Self-Assessment
| Others |
| ISA | Institut de Selection Animale
| Others |
| ISA | Institute De Selection Animale
| Others |
| ISA | Institute for Self Actualisation
| Others |
| ISA | Institute Of Self Actualization
| Others |
| ISA | Institution of Surveyors, Australia
| Others |
| ISA | Instruction Set Architecture
| Others |
| ISA | Instruction Stable Alert
| Others |
| ISA | Instrumentation Society of A
| Others |
| ISA | Instrumentation Society of America
| Others |
| ISA | Instrumentation Systems and Automation
| Others |
| ISA | Integrated Service Adapter
| Others |
| ISA | Integrated Starter Alternator
| Others |
| ISA | Integrated Systems Analysts
| Others |
| ISA | Integrity, Soul, and Attitude
| Others |
| ISA | Intelligence And Security Agency
| Others |
| ISA | Intelligence Support Activity
| Others |
| ISA | Intelligent Speed Adaptation
| Others |
| ISA | Intelligent Speed Advice
| Others |
| ISA | Intelligent Speed Assistance
| Others |
| ISA | Intensive Support Amount
| Others |
| ISA | Inter-Service Agreement
| Others |
| ISA | Inter-service Support Agreement
| Others |
| ISA | Interactive Services Association
| Others |
| ISA | Interface Studio Architects
| Others |
| ISA | Interim Service Agreement
| Others |
| ISA | Interim Stowage Assembly
| Others |
| ISA | Internal Security Act
| Others |
| ISA | Internal Security Agency
| Others |
| ISA | Internal Security Assessor
| Others |
| ISA | International Federation of the National Standardizing Associations
| Others |
| ISA | International Safety Auditors
| Others |
| ISA | International Sales Agent
| Others |
| ISA | International School of the Americas
| Others |
| ISA | International Schools Assessment
| Others |
| ISA | International Seabed Authority
| Organization |
| ISA | International Security Alliance
| Others |
| ISA | International Sign Association
| Others |
| ISA | International Slackline Association
| Others |
| ISA | International Slacklining Association
| Others |
| ISA | International Society of Andrology
| Others |
| ISA | International Society of Appraisers
| Others |
| ISA | International Society of Arboriculture
| Others |
| ISA | International Society of Audiology
| Others |
| ISA | International Society of Automation
| Others |
| ISA | International Solar Agency
| Others |
| ISA | International Solar Alliance
| Others |
| ISA | International Standard Architecture
| Others |
| ISA | International Standard Atmosphere
| Others |
| ISA | International Standard of Auditing
| Others |
| ISA | International Standard on Auditing
| Others |
| ISA | International Standardization Agreement
| Others |
| ISA | International Standards on Auditing
| Others |
| ISA | International Strabismological Association
| Others |
| ISA | International Strategic Analysis
| Others |
| ISA | International Student Advising
| Others |
| ISA | International Student Association
| Others |
| ISA | International Students Association
| Others |
| ISA | International Studies Abroad
| Others |
| ISA | International Studies Association
| Others |
| ISA | International Sugar Agreement
| Others |
| ISA | International Surfing Association
| Others |
| ISA | International Symbol of Access
| Others |
| ISA | Internationals Schools Assessment
| Others |
| ISA | Internet Security Alliance
| Others |
| ISA | Internet Security and Acceleration
| Others |
| ISA | Internet Security Association
| Others |
| ISA | Internet Server Application
| Others |
| ISA | Internet Service Api
| Others |
| ISA | Internet Services Administrator
| Others |
| ISA | Internet Services for Alumni
| Others |
| ISA | Interoperability Standards Advisory
| Others |
| ISA | Interplanetary Strategic Alliance
| Others |
| IsA | Interstitial Acute
| Others |
| ISA | Intrinsic Sympathomimetic Activity
| Others |
| ISA | Investigative Skills Assessment
| Others |
| ISA | Investment Savings Account
| Others |
| ISA | Ionic Strength Adjuster
| Others |
| ISA | Iowa Soccer Association
| Others |
| ISA | Irish Software Association
| Others |
| ISA | ISA - The International Society for Measurement and Control
| Others |
| Isa | Isaiah
| Others |
| ISA | Islamic Students Association
| Others |
| ISA | It's So Annoying
| Others |
| ISA | Itanium Solutions Alliance
| Others |
| ISA | Iteration Symmetry and Alternation
| Others |
| ISA | Iveco South Africa
| Others |