Beney, a midfielder with Swiss club Young Boys, impressed on Friday as a second-half substitute in a 3-3 draw against another World Cup team, Zambia.
She will turn 17 two days after Switzerland opens Group A against Philippines on July 21 in Dunedin, New Zealand.
The group also includes tournament co-host New Zealand and Norway.
"We haven't taken her only as a prospect," Switzerland coach Inka Grings said of Beney.
"She can make an impression at the World Cup."
Alongside Beney, five others in the 23-player squad have more than 100 national team appearances: Barcelona winger Ana-Maria Crnogorcevic, Paris Saint-Germain forward Ramona Bachmann, Real Betis goalkeeper Gaëlle Thalmann and Arsenal teammates Lia Wälti and Noelle Maritz.
Switzerland are playing at their second Women's World Cup. In 2015, the Swiss advanced from the group stage - winning 10-1 against Ecuador - before losing to hosts Canada in the round of 16.
Switzerland have a final preparation game at home on Wednesday against Morocco, another team going to the tournament in Australia and New Zealand.
SWITZERLAND WOMEN'S WORLD CUP SQUAD
Goalkeepers: Seraina Friedli (Zurich), Livia Peng (Levante), Gaëlle Thalmann (Real Betis)
Defenders: Eseosa Aigbogun (Paris FC), Luana Bühler (Hoffenheim), Viola Calligaris (Levante), Laura Felber (Servette), Noelle Maritz (Arsenal), Lara Marti (Bayer Leverkusen), Nadine Riesen (Zurich), Julia Stierli (Zurich)
Midfielders: Iman Beney (Young Boys), Sandrine Mauron (Servette), Seraina Piubel (Zurich), Géraldine Reuteler (Eintracht Frankfurt), Marion Rey (Zurich), Coumba Sow (Servette), Lia Wälti (Arsenal)
Forwards: Ramona Bachmann, (Paris Saint-Germain), Ana Maria Crnogorčević (Barcelona), Fabienne Humm (Zurich), Alisha Lehmann (Aston Villa), Meriame Terchoun (Dijon)
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AP coverage of the Women's World Cup: https://apnews.com/hub/fifa-womens-world-cup and https://twitter.com/AP-Sports
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