MRSA is methicillin-resistant Staphylococcus aureus, a bacterium.

MRSA may also refer to:

MrsA (gene), for the enzyme 2-Ketoarginine methyltransferase Metrolina Regional Scholars' Academy, Charlotte, North Carolina, US San Alberto Airport (ICAO airport code), Costa Rica Mat Zo (born 1990), pseudonym MRSA, British producer and DJ

See also Methicillin-resistant Staphylococcus epidermidis (MRSE) Sá, a surname Mursa (disambiguation)