Madiodio Dia (born 15 January 2004) is a Senegalese footballer who plays as a centre-back for FK Haugesund in the Eliteserien.
Playing for domestic club ASC Linguere until August 2023, he moved to Europe and Eliteserien club FK Haugesund. He was seen as a long-term prospect, signing a contract lasting until the end of 2028.
In the spring of 2024, he was on trial at IK Start. Instead of joining Start, he moved to another team on the southwest coast, Egersunds IK, on loan. He was among others noted for receiving a red card as Egersund was eliminated from the 2024 Norwegian Football Cup.
After being recalled to Haugesund, Dia made his Eliteserien debut in August 2024 against reigning champions Bodø/Glimt. Ahead of the 2025 Eliteserien, Dia had adapted enough to be considered as a starting player. He lacked some attacking abilities to play right back, but was seen as a choice in central defense. Some of his main strengths, owing to his stature, were defensive and attacking set pieces. Dia scored his first Eliteserien goal in May 2025 against Molde.