| Club: | Gillingham |
| Season: | 2015–16 |
| Stadium: | Priestfield Stadium |
| League: | League One |
| League Result: | 9th |
| Cup1: | FA Cup |
| Cup1 Result: | First round (knocked out by Stevenage) |
| Cup2: | League Cup |
| Cup2 Result: | Second round (knocked out by Birmingham City) |
| Cup3: | Football League Trophy |
| Cup3 Result: | Southern Quarter-final (knocked out by Yeovil Town) |
| Cup4: | Kent Senior Cup |
| Cup4 Result: | Second round (knocked out by Dartford) |
| League Topscorer: | Bradley Dack (13) |
| Season Topscorer: | Bradley Dack (15) |
| Highest Attendance: | 9,375 vs Millwall (8 May 2016) League One |
| Lowest Attendance: | 1,832 vs Yeovil Town (10 November 2015) EFL Trophy |
| Average Attendance: | 6,316 |
| Prevseason: | 2014–15 |
| Nextseason: | 2016–17 |
| Pattern B1: | _whitestripeonleft |
| Pattern So1: | _blue_midband_color |
| Leftarm1: | 0000FF |
| Body1: | 0000FF |
| Rightarm1: | 0000FF |
| Shorts1: | 0000FF |
| Socks1: | FFFFFF |
| Pattern B2: | _leftstripeonwhite |
| Pattern So2: | _white_midband_color |
| Leftarm2: | FFFFFF |
| Body2: | 0000FF |
| Rightarm2: | FFFFFF |
| Shorts2: | FFFFFF |
| Socks2: | 0000FF |
| Pattern B3: | _redblue_vertical |
| Leftarm3: | FF0000 |
| Body3: | FF0000 |
| Rightarm3: | FF0000 |
| Shorts3: | FF0000 |
| Socks3: | FF0000 |
The 2015–16 season was Gillingham's 123rd season in their existence and third consecutive season in League One.[1] Along with League One, the club competed in the FA Cup, League Cup, Football League Trophy and the regional Kent Senior Cup. The season covers the period from 1 July 2015 to 30 June 2016.
| Date from | Position | Nationality | Name | From | Fee | Ref. | |
|---|---|---|---|---|---|---|---|
| 1 July 2015 | CF | Free transfer | [2] | ||||
| 1 July 2015 | LB |  | Free transfer | [3] | |||
| 1 July 2015 | RB | Free transfer | [4] | ||||
| 1 July 2015 | RW | Elliott List | Free transfer | [5] | |||
| 1 July 2015 | CF | Free transfer | [6] | ||||
| 2 July 2015 | CB | Free transfer | [7] | ||||
| 7 August 2015 | CM | Free transfer | [8] |
| Date from | Position | Nationality | Name | To | Fee | Ref. | |
|---|---|---|---|---|---|---|---|
| 1 July 2015 | LW | Released | |||||
| 1 July 2015 | RB | Free transfer | |||||
| 1 July 2015 | CB | Free transfer | [9] | ||||
| 1 July 2015 | LB | Free transfer | |||||
| 1 July 2015 | RB |  | Millwall | Free transfer | [10] | ||
| 2 September 2015 | CM | Free agent | Mutual consent | [11] | |||
| 15 January 2016 | FW | Ben Williamson | Cambridge United | Undisclosed | [12] |
| Date from | Position | Nationality | Name | From | Date until | Ref. | |
|---|---|---|---|---|---|---|---|
| 20 July 2015 | DM | 3 January 2016 | [13] | ||||
| 24 July 2015 | CB | 3 January 2016 | [14] | ||||
| 2 October 2015 | CB | Harry Lennon | Charlton Athletic | 20 November 2015 | [15] | ||
| 13 November 2015 | FW | Dominic Samuel | Reading | 8 May 2016 | [16] [17] [18] | ||
| 27 January 2016 | LB | Adam Chicksen | Brighton & Hove Albion | 17 March 2016 | [19] | ||
| 12 February 2016 | FW | George Williams | Fulham | 8 May 2016 | [20] | ||
| 26 February 2016 | CB |  | Adam El-Abd | Bristol City | 8 May 2016 | [21] | |
| 19 March 2016 | MF | Andrew Crofts | Brighton & Hove Albion | 8 May 2016 | [22] |
| Date from | Position | Nationality | Name | To | Date until | Ref. | |
|---|---|---|---|---|---|---|---|
| 15 August 2015 | CB | 15 September 2015 | [23] | ||||
| 22 September 2015 | CB | Callum Davies | 24 October 2015 | [24] | |||
| 1 October 2015 | CF | Greg Cundle | East Grinstead Town | 9 November 2015 | [25] | ||
| 10 February 2016 | CF | Greg Cundle | Tilbury | 4 March 2016 | [26] | ||
| 4 March 2016 | CF | Greg Cundle | Margate | 4 April 2016 | [27] | ||
| 30 March 2016 | CB | Mitchell Dickenson | Hastings United | 3 April 2016 | [28] |
On 17 June 2015, the fixtures for the season were announced.[29]