Novus ordo saeculorum - A new order of ages
Novus ordo seclorum - A new order for the ages. (appears on the U.S. one-dollar bill)
Nulla avarita sine poena est - There is no avarice without penalty. (Seneca)

Nulla dies sine linea

Not a day without a line. Do something every day! (Apeles, Greek painter)

Nulla regula sine exceptione - There is no rule/law without exception
Nulla res carius constat quam quae precibus empta est - Nothing is so expensive as that which you have bought with pleas. (Seneca)
Nulla vit melior quam bona - There's no life better than a good life
Nulli expugnabilis hosti - Conquered By No Enemy. (motto of Gibraltar)
Nulli secundus - Second to none
Nullius in verba - (Rely) on the words on no one. (Horace)