CSFB may refer to: Cabbage-stem flea beetle, a pest of oilseed rape in Northern Europe. Credit Suisse First Boston, the current (2022–present) and former (1996–2006) investment bank of Credit Suisse. College Students for Bernie, a former organization dedicated to increase young voter participation, during Bernie Sanders 2016 presidential campaign. Circuit Switch Fall Back (or CS fallback), a feature in LTE telecommunications.