Nil satis nisi optimum ("Nothing but the best is good enough") is a Latin phrase which has been used as the motto of the following:

• 967 Squadron of the Air Training Corps
• Everton FC
• Carlton le Willows Academy
• Clifton Hunter High School
• Community for United Biological Sciences^[1]
• Inala Country School
• Escondido Charter High School
• John D. O'Bryant School of Mathematics & Science
• Loughborough University
• Okehampton College
• Proviso East High School^[2]
• Rutlish School
• St Francis of Assisi Catholic College^[3]
• Strathcona-Tweedsmuir School^[4]
• Westerford High School
• Priory Dental Centre^[5]