MRS can refer to: Maritime Reaction Squadron, a South African military unit The Market Research Society Marseille Provence Airport, IATA airport code Materials Research Society Monks Risborough railway station, England; National Rail station code MRS Movimiento Renovador Sandinista, a political party in Nicaragua, see Sandinista Renovation Movement MRS Logística S.A. Mandibular repositioning splint Magnetic resonance spectroscopy Marginal rate of substitution, in economics Materi… (More on Mrs)