What is the longest word in the Dutch language? That depends upon who you ask...

Officially, according to Van Dale, the longest Dutch word is meervoudigepersoonlijkheidsstoornis (35 letters) which, when plural, becomes even longer: meervoudigepersoonlijkheidsstoornissen (38 letters). 

According to the free OpenTaal dictionary, the longest word in the Dutch language is aansprakelijkheidswaardevaststellingsveranderingen, coming in at a very impressive 50 letters.

Back in 2007, the popular Dutch TV show Lingo held a competition where viewers could submit their entries for the longest word in the Dutch language. The winner of said competition was (brace yourself) kindercarnavalsoptochtvoorbereidingswerkzaamhedencomitéleden at a whopping 60 letters!