Sr

Sr, Sr. or sr as an abbreviation may refer to:

• Senior, a suffix to a person's name, usually male
• Serbian language (ISO 639 alpha-2)
• Sister, a prefix to a religious sister's name
• Strontium, the 38th element on the periodic table
• The symbol of steradian, metric (SI) unit of solid angle
• The Sunderland postcode area in the UK
• The sarcoplasmic reticulum, also known as smooth endoplasmic reticulum .
• Suriname, a country in South America
  • .sr, Suriname's Internet top-level domain
• The Spanish abbreviation for Señor, an honorific prefix equivalent to Mr. often seen in English