Lia Wälti
| 
 Wälti during a press conference with Switzerland in 2017  | |||
| Personal information | |||
|---|---|---|---|
| Full name | Lia Joëlle Wälti | ||
| Date of birth | 19 April 1993 | ||
| Place of birth | Langnau im Emmental, Bern, Switzerland | ||
| Height | 1.67 m (5 ft 6 in) | ||
| Position(s) | Midfielder | ||
| Team information | |||
Current team  | Arsenal | ||
| Number | 13 | ||
| Senior career* | |||
| Years | Team | Apps | (Gls) | 
| 2008–2009 | Köniz | ||
| 2009–2013 | YB Frauen | ||
| 2013–2018 | Turbine Potsdam | 97 | (7) | 
| 2018– | Arsenal | 113 | (1) | 
| International career‡ | |||
| 2011– | Switzerland | 125 | (5) | 
| 
*Club domestic league appearances and goals, correct as of 10 May 2025 ‡ National team caps and goals, correct as of 8 April 2025  | |||
Lia Joëlle Wälti (Swiss Standard German: [ˈliːa joˈɛlə ˈvɛlti]; born 19 April 1993) is a Swiss professional footballer who plays as a midfielder for Women's Super League club Arsenal and captains the Switzerland national team. Before signing for Arsenal in July 2018, she played for Nationalliga A club YB Frauen from 2009 until 2013 and for Bundesliga club Turbine Potsdam from 2013 until 2018.
She has been a member of the Switzerland national team since August 2011. As an Under-19 international she played the 2009 U-19 European Championship and the 2010 U-20 World Cup.