Marex may refer to:
Medicine Marex, or Terbutaline, used as a "reliever" inhaler in the management of asthma symptoms among other uses
Companies Marex (British company) UK-based tech-enabled liquidity hub Sevilleja v Marex Financial Ltd 2020 Supreme Court of the United Kingdom Marex telemetry Location-based service (Nasdaq: MRXX) Marex, Miami Florida shipwreck recovery company established 1982 Wreck of the Titanic MarEx (The Maritime Executive), news service, Florida established 1997 Marex Petroleum Juan de Nova Island