BSR is an abbreviation that has a number of meanings:
- Berkeley Science Review, a magazine published by graduate students at UC Berkeley
- Birmingham Sound Reproducers, a British audio, electronics and record player manufacturer; also known as BSR McDonald and, later, Astec Power Supply
- Bit Scan Reverse, an x86 architecture instruction; see the Find First Set instruction
- Bootstrap Router, a term used in IP Multicast
- Brain stimulation reward
- The British School at Rome
- The Broadband Services Router
- Brown Student/Community Radio, Providence, RI student and community radio station
- Buddhist Studies Review, a journal published by the UK Association for Buddhist Studies
- Business for Social Responsibility, a non-profit that promotes social responsibility in businesses
- Bun Spliff Regular - A non profit organisation of herbalists
- Blood Stained Reality - A hardcore/punk band from San Diego