KMS may refer to:
Organizations Keenie Meenie Services, private military contractor Korean Mathematical Society National Survey and Cadastre of Denmark (), former name of the Danish Geodata Agency Kosovar Mathematical Society
Science and technology Kabuki makeup syndrome, a congenital disorder Kasabach–Merritt syndrome, a disease involving a vascular tumor KMS state (Kubo–Martin–Schwinger), in quantum thermodynamics
Computing Kernel mode-setting, of computer display KMS driver, Linux kernel device driver KMS (hypertext), the Knowledge Management System hypertext system Key Management Service, a Microsoft technology Key management system, in cryptography
Other uses Kumasi Airport (IATA code KMS), Ghana KMS, a ship prefix sometimes attributed to vessels of the Kriegsmarine Kayla/KMS, aliases for former hacker Ryan Ackroyd
See also KMS-4, a North Korean satellite of the Kwangmyŏngsŏng program