Johannes Gerardus Adrianus "John" Lammers (; born 11 December 1963) is a Dutch professional football manager and former player who is an assistant coach with Turkish Süper Lig club ðstanbul Baà Âakà Âehir.
Lammers started his professional career in the 1982âÂÂ83 season. He played as a forward for Willem II Tilburg, RKC Waalwijk, VVV-Venlo, Toulon, NAC Breda, RBC Roosendaal and New Zealand club Auckland Kingz.
After his active career he started to work as an assistant coach, and also served as striker coach at Feyenoord Rotterdam's youth complex. He was subsequently signed by SBV Excelsior as Alex Pastoor's aide at the small Rotterdam-based club. In June 2011, after the departure of Pastoor to NEC, he was promoted as head coach for the new season. After one year to serve as head coach, he left Excelsior in charge of Eerste Divisie club FC Eindhoven. He signed a two-year contract with the club.
In June 2017 he was named new head coach of Danish Superliga club Esbjerg fB. He was dismissed in September 2019.
On 25 June 2022, Heracles Almelo appointed Lammers as head coach on a two-year deal with an option for another year, after the club had suffered relegation to the second-tier Eerste Divisie. In his first season in charge, Lammers gained the club promotion back to the top division.
On 26 March 2024, Lammers was announced as VVV-Venlo's new head coach ahead of the 2024âÂÂ25 season, replacing the outgoing Rick Kruys who had decided to seek new challenges. Lammers signed a two-year contract. He left VVV-Venlo on 11 September 2025.
Two days later, Lammers was hired by ðstanbul Baà Âakà Âehir in Turkey as an assistant to Nuri à Âahin.