"Hen" will be added to "han" (he) and "hon" (she) as one of 13,000 new words in the latest edition of the Swedish Academy's SAOL.
The pronoun is used to refer to a person without revealing their gender - either because it is unknown, because the person is transgender, or the speaker or writer deems the gender to be superfluous information.
"For those who use the pronoun, it's obviously a strength that it is now in the dictionary," one of the editors, Sture Berg, told AFP.
But the word never really took hold.
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It resurfaced around 2000, when the country's small transgender community latched onto it, and its use has taken off in the past few years.
It can now be found in official texts, court rulings, media texts and books, and has begun to lose some of its feminist-activist connotation.
The Swedish Academy's dictionary is updated every 10 years. New entries are determined by their frequency and relevance.