This is a list ofoperating systems specifically focused onsecurity. Similar concepts includesecurity-evaluated operating systems that have achieved certification from anauditing organization, andtrusted operating systems that provide sufficient support formultilevel security and evidence ofcorrectness to meet a particular set of requirements.

• GrapheneOS uses a hardened kernel, C library, custom memory allocator (hardened_malloc) and offers privacy/security features, such as Duress PIN/Password or disabling the USB-C port at a driver/hardware level to avoid exploitation.

• Tails is aimed at preservingprivacy andanonymity.^[1]
• Whonix consists of twovirtual machines. All communications are routed throughTor.^[2][3][4]
• Linux Kodachi is a security-focused operating system.^[5]

• Alpine Linux is designed to be small, simple, and secure.^[6] It usesmusl,BusyBox, andOpenRC instead of the more commonly usedglibc,GNU Core Utilities, andsystemd.^[7]
• Owl - Openwall GNU/Linux, a security-enhanced Linux distribution for servers.
• Secureblue, aFedora Silverblue based distro that uses the same hardened malloc as GrapheneOS.

• OpenBSD is aUnix-likeoperating system that emphasizesportability,standardization,correctness, proactivesecurity, and integratedcryptography.^[8]

• Qubes OS aims to providesecurity through isolation.^[9] Isolation is provided through the use ofvirtualization technology. This allows the segmentation of applications into securevirtual machines.

• Computer security
• Operating system security
• Lists of operating systems

• Articles with short description
• Short description is different from Wikidata
• Use dmy dates from July 2018