Incertae sedis (Latyn vir: 'van onsekere plasing') of problematica is 'n term wat gebruik word vir 'n taksonomiese groep waar die breër verwantskappe daarvan onbekend of ongedefinieer is.
Alternatiewelik word daar gereeld na sulke groepe verwys as "raaiselagtige taksa". In die stelsel van oop nomenklatuur, onsekerheid op spesifieke taksonomiese vlakke word aangedui deur incertae familiae (van onsekere familie), incerti subordinis (van onsekere suborde), incerti ordinis (van onsekere orde) en soortgelyke terme.
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