Jessikka Aro (born 19 December 1980) is a Finnish journalist working for Finland's public service broadcaster Yle and an author of a non-fiction book Putin's Trolls.

Aro saw the actions of Kremlin-connected internet trolls as "a threat to Finnish people's freedom of speech" telling Deutsche Welle (DW) she "was really astonished to find out that it's quite big—super big actually.

[8] A vocal critic was Johan Bäckman, who made false claims about her assisting the Estonian and United States security services.

[7] In 2016, Aro published an article in the journal of the centre-right European Peoples Party describing the "brutal" harassment that she attributes to Russian trolls.

[17][18] In October 2018, the Helsinki District Court found Ilja Janitskin [fi], Johan Bäckman and a woman guilty of sustained defamation against Aro.