| Stadium Name: | Arena Inamar |
| Nickname: | Distrital do Inamar |
| Fullname: | Estádio Municipal José Batista Pereira Fernandes |
| Location: | Diadema, SP, Brazil |
| Coordinates: | -23.7226°N -46.6131°W |
| Opened: | 22 May 2009 |
| Renovated: | 2012, 2014, 2019–2020 |
| Expanded: | 2015 |
| Record Attendance: | 7,283 (Água Santa vs São Bernardo, 10 April 2016) |
| Owner: | City of Diadema |
| Operator: | City of Diadema |
| Surface: | Natural grass |
| Construction Cost: | R$ 12–15 million |
| Tenants: | (2009–2019) Água Santa (2012–) |
| Seating Capacity: | 10,000 |
| Dimensions: | 105x |
Estádio Municipal José Batista Pereira Fernandes, known as Distrital do Inamar or Arena Inamar, is a football stadium in Diadema, São Paulo, Brazil. It has a maximum capacity of 10,000 people, and hosts the home matches of Água Santa.
Inaugurated on 22 May 2009 to attend amateur matches of the region, the stadium only held a professional match on 27 April 2013, when beat Mauaense by 5–1 in a Campeonato Paulista Segunda Divisão match.[1] It was named after José Batista Pereira Fernandes, a community leader in the local nearby neighbourhoods who devoted his life to the well-being of the people.[2]
The stadium saw Água Santa's meteoric rise through the tiers of the Campeonato Paulista, but never had any night matches due to the lighting structure.[3]