The 2015–16 season was Sheffield Wednesday's fourth consecutive season in the Championship. Along with competing in the Championship, the club also participated in the FA Cup and League Cup.

The season covers the period from 1 July 2015 to 30 June 2016.

Prior to the start of the pre-season schedule the club announced that eleven players had been released after reaching the end of their contracts. Also in June, head coach Stuart Gray was sacked after 18 months in charge.Carlos Carvalhal was announced as Gray's replacement on 30 June 2015.

Sheffield Wednesday got their 2015–16 season underway at Hillsborough to Bristol City - a match that The Owls won 2–0 thanks to second half goals from Tom Lees and Lewis McGugan who signed a permanent deal after spending last season on loan at the club. This was followed by a victory in the Capital One Cup - which was also at Hillsborough - with a 4–1 victory over League Two side Mansfield Town. The second league match of the season was a 2–1 away loss to Ipswich Town. This was followed by two consecutive 1–1 draws which were at home to Reading and away to Leeds United respectively. In the next game The Owls progressed into the third round of the Capital One Cup with a 1–0 win over Oxford United. This was followed by the first home defeat of the season with a 3–1 loss to Middlesbrough.

The Owls lost their first game of September in a 3–1 defeat to Burnley at Turf Moor. This was followed by a goalless draw at the Macron Stadium against lowly Bolton Wanderers and The Owls' second league victory of the season - a 3–2 win against Fulham at Hillsborough, in which star signing Fernando Forestieri scored his first goal since moving from Watford, a simple close range finish on 5 minutes. A few days later Sheffield Wednesday progressed into the fourth round of the Capital One Cup with a 1–0 win against Newcastle United with Lewis McGugan scoring the game's only goal in a shock result. The Owls' last game of September was a 2–1 away win at Brentford thanks to an Atdhe Nuhiu penalty and a late winner from Lucas João.

The Owls got October off to a winning start with a 3–1 win against Preston North End at Hillsborough. This was followed by two consecutive draws - 1–1 against Hull City at Hillsborough and 0–0 away to Queens Park Rangers. The following game saw Sheffield Wednesday win 2–1 against local rivals Rotherham United at the New York Stadium thanks to a goal each from Fernando Forestieri and Lucas João respectively. The Owls' next game was a 3–0 victory over Premier League side Arsenal in the Capital One Cup at Hillsborough. To end the month The Owls won 1–0 at home against Nottingham Forest - thus completing the month unbeaten.

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