Open access is access to material via the Internet in such a way that the material is free for all users to read and use. Open access may also refer to:

• OpenAccess, a common database initiative in electronic design automation
• Open Access Network, a horizontally layered network architecture and business model
• Open access publishing, publication of material in such a way that it is available without barriers to all people
• Open Access Same-Time Information System, a policy for transmission service
• Open Access (Infrastructure) such as railways.

Open access may also be used for:

• Right of public access to the wilderness, a legal right to travel through open countryside
• Open Communication, open access to communications instrastructure and services
• Investigational product
• Wireless community network

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