The 2017–18 season is Arsenal's 26th in the Premier League and 98th consecutive season in the top flight of English football. The club will participate in the Premier League, the FA Cup (as holders), the EFL Cup, the UEFA Europa League and the Community Shield.

This will be the first season that Arsenal will not be participating in the UEFA Champions League since 1997–98. It will be the first time they have played in the UEFA Europa League since its rebranding, having last participated in the 1999–2000 UEFA Cup. The season covers the period from 1 July 2017 to 30 June 2018.

Arsenal made their first summer signing on 6 June, getting Sead Kolašinac for free on 1 July after his Schalke contract expired. Also, on 5 July, Arsenal were manage to secure a deal for a previous target, Alexandre Lacazette from Lyon for an undisclosed price believed to be about £46.5 million. Arsenal then took a 25-man squad to play in Australia. The squad included seven Under 23s including Reiss Nelson and Joe Willock plus both of the new signings. The first match was on 13 July, which was a 2-0 win over Sydney FC where the captain, Mertesacker scored an overhead kick and Lacazette scored a debut goal after coming on as a sub. Two days afterwards, Arsenal faced a second Sydney side, Western Sydney Wanderers in front of 83,000 people. Arsenal won 3-1 after first half goals from Giroud, Ramsey and Elneny. Arsenal then jetted off to China to face Bayern Munich in Shanghai in the International Champions Cup. Iwobi scored an equaliser in the dying seconds of the game, which Arsenal won on penalties 3-2. The 25-man squad travelled up to Beijing to face Premier League rivals, Chelsea. Unfortunately, it was a pretty convincing win for the Blues, who netted three times. On 29 and 30 July, the Emirates Cup took place. Arsenal, Benfica, RB Leipzig and Sevilla all took part in the tournament which Arsenal won after a 5-2 win over Benfica but a 2-1 loss to Sevilla. Over the tournament, Walcott was the top scorer with 2 goals, both against Benfica. Giroud and Iwobi also scored one each against Benfica and Lacazette scored one past Sevilla.

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