Charlton retired from playing in 1973, later going into management.
He had spells in charge of Middlesbrough, Sheffield Wednesday, Newcastle United and the Republic of Ireland.
Charlton managed to guide the Irish team to three major tournaments, with Sinn Fein leader Mary Lou McDonald describing him as "Ireland's most beloved English man".
"Sorry to hear of his passing. He kept 'em all under pressure and kept us all cheering the boys in green on. Ar dheis De go raibh a anam," she said.
- SKY NEWS