Sincerus

Sincerus may refer to:

The Latin word for sincere or:

People

 * Sincerus, Roman Catholic Bishopric of Amelia in the fifth century

Pseudonyms

 * Samuel Adams (1722-1803) American statesman
 * Elias Schwarzfeld (1855–1915), Moldavian and later Romanian Jewish historian, essayist, novelist and newspaperman who wrote as Edmond Sincerus
 * Karl-August von Reisach (1800–1869), German Catholic theologian and Cardinal who wrote under Augusts Sincerus
 * Sigmund Richter, a probable progenitor of the Order of the Golden and Rosy Cross who used the name Sincerus Renatus
 * Peter Joseph Elvenich (1796–1886), German Catholic theologian and philosopher who wrote under Sincerus Pacificus
 * Georg Ludwig Oeder, theologian and father of Georg Christian Oeder, who used the pseudonym Sincerus Pistophilus

Scientific names

 * Tropidozineus sincerus, a species of beetle
 * Adoretus sincerus, a species of beetle