The river name Ems may refer to:

• Ems (river), a river in northwestern Germany and northeastern Netherlands, discharges in the Dollart Bay
• Ems (Eder), a river of Hesse, Germany, tributary of the Eder
• River Ems (Chichester Harbour), a river in the English counties of West Sussex and Hampshire

• Microthamniales
• Microtheca (beetle)
• Microtheca ochroloma
• Microtheca picea
• Microthelia incarcerata
• Microthrissa royauxi
• Microthyatira decorata
• Microtidium atratum
• MicroTimes
• Microtis alba
• Microtis alboviridis
• Microtis angusii
• Microtis arenaria
• Microtis atrata
• Microtis brownii
• Microtis cupularis
• Microtis densiflora
• Microtis (disambiguation)
• Microtis eremaea
• Microtis eremicola
• Microtis familiaris
• Microtis globula
• Microtis graniticola
• Microtis media subsp. densiflora
• Microtis media subsp. media