The 2023 Nagoya Grampus season was Nagoya Grampus' 6th season back in the J1 League following their relegation at the end of the 2016 season, their 30th J1 League season and 40th overall in the Japanese top flight. Nagoya Grampus finished the season 6th in the J1 League, reached the Quarterfinal of the Emperor's Cup and Semifinal of the J. League Cup.
On 5 January, Nagoya Grampus announced the singing of Kasper Junker on loan from Urawa Red Diamonds for the season.
On 13 March, Nagoya Grampus announced the signing of Daichi Sugimoto from Vegalta Sendai.
On 25 May, Nagoya Grampus announced that Shumpei Naruse's loan to Montedio Yamagata had been terminated and that he had joined Mito HollyHock on loan until 31 January 2024.
On 25 June, Nagoya Grampus announced the signing of Taika Nakashima on loan for the remainder of the season from Hokkaido Consadole Sapporo.
On 26 July, Nagoya Grampus announced the signing of Tojiro Kubo from Fujieda MYFC.
On 1 August, Nagoya Grampus announced an agreement with Saudi Pro League club Al Taawoun, for the transfer of Mateus Castro.
On 3 August, Nagoya Grampus announced the signing of Tsukasa Morishima from Sanfrecce Hiroshima.
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|- |colspan="14"|Players away on loan:
|- |colspan="14"|Players who left Nagoya Grampus during the season: