Ok, ok, well, technically, the longest Swedish word is Realisationsvinstbeskattning (28 letters), which means “capital gain taxation” and is usually shortened to Reavinstskatt. This is according the Svenska Akademiens ordlista, which is technically correct. This is the longest word in Swedish. Technically.
How boring!
Non technically, Swedish grammar allows us to combine words to make a much longer (and much more interesting) word than Realisationsvinstbeskattning. For example, spårvagnsaktiebolagsskensmutsskjutarefackföreningspersonalbeklädnadsmagasinsförrådsförvaltarens (94 letters) which means something like “Belonging to the manager of the depot for the supply of uniforms to the personnel of the track cleaners’ union of the tramway company”.
Thank you Swedish grammar. And thank you Alexander Skarsgård for willing to read another long Swedish word on YouTube for our enjoyment.