Isabella Alexa Ludwig (born 13 December 2002) is a South African soccer player who plays as a midfielder for SAFA Women's League club Mamelodi Sundowns Ladies and the South Africa women's national team.
Ludwig played for Tuks Ladies and was part of the squad that were runners-up at the 2022 Sasol League National Championship.
In April 2025 she signed with SAFA Women's League side Mamelodi Sundowns Ladies. She scored on debut against UCT Ladies in 2-0 win on 12 April 2025.
Ludwig competed for the senior women's national team at the 2024 COSAFA Women's Championship. She made her debut on 22 October 2024 against Namibia.