Lia Joëlle Wälti (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.

[5] In 2002, at the age of 8, she started playing for FC Langnau, a boys football team coached by her father.

In 2007 she was admitted to the Huttwill Training Centre and, half a year later, she joined Team Bern West.

At the same time she played for Team Bern West, Wälti joined FC Köniz of the Swiss Challenge League.

On 21 August 2011, Wälti made her debut for the Switzerland senior team in a match against Scotland.