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As of 2017, by her description in interview, Waterston held [[dual-citizenship|dual citizenship]],[{{cite AV media |people= Horowitz, Josh (host); Waterston; Katherine |date=17 May 2017 |title= Michael Fassbender (Vol. III) & Danny McBride; Katherine Waterston |work= Happy Sad Confused, Episode 159 | type=podcast| language= en |location= New York, NY |publisher= MTV Podcast Network |time= 1:11:42 |url= https://podcasts.apple.com/us/podcast/happy-sad-confused/id827905050 | access-date=2026-02-22 | url-access = registration}} The Waterston interview segment occurs from 0:45:30-1:22:22, with the timestamp presenting the dual citizenship statement as presented. An archive of the podcast can be found at [https://web.archive.org/web/20191127004623/http://dcs.megaphone.fm/MTV3177593384.mp3?key=b1e962a281b2a42fa27c31ded8a8d844this link], archive date November 27, 2019, access-date February 22, 2026.] English and American.{{cn|date=February 2026}} |
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As of 2017, by her description in interview, Waterston held [[dual-citizenship|dual citizenship]],[{{cite AV media |people= Horowitz, Josh (host); Waterston; Katherine |date=17 May 2017 |title= Michael Fassbender (Vol. III) & Danny McBride; Katherine Waterston |work= Happy Sad Confused, Episode 159 | type=podcast| language= en |location= New York, NY |publisher= MTV Podcast Network |time= 1:11:42 |url= https://podcasts.apple.com/us/podcast/happy-sad-confused/id827905050 | access-date=2026-02-22 | url-access = registration}} The Waterston interview segment occurs from 0:45:30-1:22:22, with the timestamp presenting the dual citizenship statement as presented. An archive of the podcast can be found at [https://web.archive.org/web/20191127004623/http://dcs.megaphone.fm/MTV3177593384.mp3?key=b1e962a281b2a42fa27c31ded8a8d844this link], archive date November 27, 2019, access-date February 22, 2026.] British and American.{{cn|date=February 2026}} |
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For a number of years she was in a relationship with American playwright [[Adam Rapp]].[{{cite web |url=https://www.standard.co.uk/lifestyle/esmagazine/fantastic-beasts-katherine-waterston-on-coping-with-harry-potter-mania-a3390551.html |title=Fantastic Beasts' Katherine Waterston on coping with Harry Potter mania |date=November 10, 2016 |work=The Evening Standard |access-date=December 10, 2018}}][{{cite news |last1=Pollard |first1=Alexandra |title=Katherine Waterston: ‘It’s still pretty much a nightmare to be a woman’ |url=https://www.independent.co.uk/arts-entertainment/films/features/katherine-waterston-interview-world-to-come-b1889247.html |access-date=16 March 2026 |work=The Independent |date=23 July 2021}}] His 2011 three-play collection ''The Hallway Trilogy'' is dedicated to her;[{{cite book | last = Rapp | first = Adam | author-link = Adam Rapp | title = The Hallway Trilogy | publisher = Theatre Communications Group | location = New York | date = 2013 | page = iv | isbn = 978-1559364164 }}] she appeared as Rose Hathaway in ''Part 1: Rose'' in its premiere at the [[Rattlestick Playwrights Theater]].[{{cite news |last1=Stasio |first1=Marilyn |title=The Hallway Trilogy |url=https://variety.com/2011/legit/reviews/the-hallway-trilogy-1117944737/ |access-date=16 March 2026 |work=Variety |date=28 February 2011}}] |
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For a number of years she was in a relationship with American playwright [[Adam Rapp]].[{{cite web |url=https://www.standard.co.uk/lifestyle/esmagazine/fantastic-beasts-katherine-waterston-on-coping-with-harry-potter-mania-a3390551.html |title=Fantastic Beasts' Katherine Waterston on coping with Harry Potter mania |date=November 10, 2016 |work=The Evening Standard |access-date=December 10, 2018}}][{{cite news |last1=Pollard |first1=Alexandra |title=Katherine Waterston: ‘It’s still pretty much a nightmare to be a woman’ |url=https://www.independent.co.uk/arts-entertainment/films/features/katherine-waterston-interview-world-to-come-b1889247.html |access-date=16 March 2026 |work=The Independent |date=23 July 2021}}] His 2011 three-play collection ''The Hallway Trilogy'' is dedicated to her;[{{cite book | last = Rapp | first = Adam | author-link = Adam Rapp | title = The Hallway Trilogy | publisher = Theatre Communications Group | location = New York | date = 2013 | page = iv | isbn = 978-1559364164 }}] she appeared as Rose Hathaway in ''Part 1: Rose'' in its premiere at the [[Rattlestick Playwrights Theater]].[{{cite news |last1=Stasio |first1=Marilyn |title=The Hallway Trilogy |url=https://variety.com/2011/legit/reviews/the-hallway-trilogy-1117944737/ |access-date=16 March 2026 |work=Variety |date=28 February 2011}}] |