|Date of birth||28 November 1986|
|Place of birth||Dakar, Senegal|
|Height||1.76 m (5 ft 9 in)|
|Playing position||Full back|
|* Senior club appearances and goals counted for the domestic league only and correct as of 16 December 2011.
† Appearances (Goals).
Dabo began his career with ASC Yeggo and he then joined French club Saint-Étienne's youth academy when he was 14 years old. In the summer of 2004 he was promoted to the club's senior team by manager Élie Baup. On 7 May 2005, Dabo made his debut for Saint-Étienne in a 2–0 win over Toulouse and made three appearances in total in his first season. Baup's successor Ivan Hašek put Dabo in the right back position before newly manager Laurent Roussey switched him into the left back role.
Dabo's second season proved to be the breakout year for the player as he received more playing time. On 21 September 2008, Dabo scored his first goal for Saint-Étienne against Paris Saint-Germain. The result was 1–0 in favor of Saint-Étienne. On 7 February 2009, Dabo scored an own goal against Caen. However, Saint-Étienne won the match 3–2 with goals from Bafétimbi Gomis and Ilan, who scored twice. In January 2009, club manager Alain Perrin told Le Progrès that Dabo, who had one year left on his contract at the time, refused all proposals on an extension.
Following his contract expiration, Dabo signed a four-year contract with Spanish club Sevilla on a free transfer, making him the first signing for the club. He made his debut for Sevilla in the first leg of the team's Supercopa de España tie against Barcelona on 14 August 2010. Two weeks later, Dabo made his league debut for Sevilla in a 4–1 win over Levante. On 19 December 2010, he received his first red card of his career after he kicked goal-scorer Ángel di María in a 1–0 loss against Real Madrid.
After just one season in Spain, in August 2011, Dabo returned to France signing a four-year contract with Lyon. The transfer fee was priced at €1 million plus a possible €800k in incentives. On 18 September 2011, Dabo made his debut for Lyon in a 2–0 win over Marseille after coming on a substitute for Anthony Réveillère. On 29 October 2011, he played his first match against his former club Saint-Étienne in a 2–0 win, but received a straight red card in the second half after foul on Bănel Nicoliță. In the Coupe de la Ligue, Dabo received his second red card of the season 2–1 win over Lille on 11 January 2012.
- Foot – L1 – Saint-Etienne – Dabo prolonge
- "Dabo swaps St-Etienne for Sevilla". UEFA.com. 24 May 2010. Retrieved 29 June 2010.
- "Sevilla sign Mouhamadou Dabo". FootballEspana. 23 May 2010. Retrieved 10 March 2012.
- "Report:Real Madrid v Sevilla FC". ESPN Soccernet. 19 December 2010. Retrieved 29 June 2012.
- "Dabo returns to France with Lyon". ESPN Soccernet. 30 August 2011. Retrieved 30 August 2011.
- "Official: Olympique Lyonnais snap up Mouhamadou Dabo from Sevilla". Goals.com. 31 August 2011. Retrieved 10 March 2012.
- "Report:Lyon v St Etienne". ESPN Soccernet. 29 October 2011. Retrieved 29 June 2012.
- France U-21 season 2006–07