The 2015–16 Sydney FC season was the club's 11th season since its establishment in 2004. The club participated in the A-League for the 11th time, the FFA Cup for the 2nd time, as well as the AFC Champions League for the 3rd time.

Sydney FC began the pre-season with a 7–0 win over Earlwood Wanderers. The club then announced the annual Macarthur Rams pre-season clash. The match took place on 30 July 2015, with Sydney FC cruising to a comfortable 5–1 victory. For both games, Sydney FC fielded mainly youth players and trialist's, of which included Matt Simon and Alex Mullen who would later go on to sign for the club. The club announced a third pre-season friendly against a team of Gold Coast Premier League All-stars for mid-August. However, this match would be ultimately be cancelled as the venue did not meet one of the criteria for Football Federation Australia sanctioned friendlies.

Rumours throughout the end of the 2014–15 A-League season that Sydney FC had signed Newcastle Jets and Young Socceroo midfielder, Andrew Hoole were confirmed on 30 April 2015. Following the Grand Final loss to Melbourne Victory key members of the team were still weighing up their options for the season. Initially it was thought the services of Golden Boot winner, Marc Janko would be secured but after he left for Europe the day after the grand final to plan his wedding, rumours circled that he would not return. This was confirmed a week later with the club citing the amount of games Janko would miss throughout the season as the A-League does not stop during FIFA breaks a factor in the decision. Janko expressed his displeasure of how things were handled through social media site, Twitter. Senegalese cousins Mickaël Tavares and Jacques Faty were quick to re-sign with club, extending their contracts from injury replacement players to full contracts. The club confirmed the signing's of Tavares for two years on 21 May 2015 and one year for Faty on 27 May 2015. The club also announced a two-year deal for striker Shane Smeltz on the same day.

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