Gabrissa Shirani Hartman (née Gioura; born 7 June 1975) is a Nauruan politician.

She then studied law at the University of South Pacific, attending their Emalus campus in Vanuatu.

Hartman then practised law and was a former deputy clerk of parliament under Speaker Ludwig Scotty before entering politics.

[2][6] She unsuccessfully contested the 2016 election as an independent, running on a platform of "good governance, gender equality and improved housing".

[9] She was then elected to parliament at a by-election on 19 January 2017 following the death of Minister for Health, Sports and Fisheries Valdon Dowiyogo.