16 men have won the tournament both as a player and as a manager. That is on separate occasions, as both a player and manager. I have not included player-managers such as John Cameron (1901, Spurs) but Kenny Dalglish (1986, Liverpool) is included as he won a subsequent final as manager.
1. Peter McWilliam
1910 - Player for Newcastle United versus Barnsley. Newcastle won 2-0 in a replay after the first game was drawn 1-1.
1921 - Spurs Manager in their 1-0 victory over Wolverhampton Wanderers at Stamford Bridge.
2. Billy Walker
1920 - An Aston Villa player as they won the Cup in a 1-0 win over Huddersfield Town at Stamford Bridge.
1935 - Managed Sheffield Wednesday as they won 4-2 in a memorable game versus West Bromwich Albion at Wembley.
1959 - Manager of Nottingham Forest in their famous 2-1 win over Luton Town.
3. Jimmy Seed
1921 - Played for Spurs in their 1-0 victory over Wolves at Stamford Bridge.
1947 - Manager of Charlton Athletic as they defeated Burnley 1-0 at Wembley after extra time. Charlton had lost the previous year's final 4-1 to Derby in another game that had been settled in extra time.
4. Stan Seymour
1924 - Player and goalscorer for Newcastle United in their 2-0 victory over Aston Villa at Wembley.
1951 and 1952 - Effectively the manager of Newcastle United, although more accurately he was head of the Director's Committee in charge of team affairs. In 1951 Newcastle defeated Blackpool 2-0 with goals from Jackie Milburn. The following year, they were successful in defending the Cup as they defeated Arsenal by George Robledo's goal on 84 minutes.
5. Joe Smith
1953 - Manager of Blackpool against Bolton in arguably the most famous Cup Final of them all.
6. Matt Busby
1934 - Player for Manchester City as they made up for losing in the previous year's final with a 2-1 victory over Portsmouth.
7. Bill Shankly
1938 - Player for Preston North End as George Mutch's goal on 119 minutes was enough to sink Huddersfield Town in the first ever televised FA Cup Final.
8. Joe Mercer
1950 - Captained Arsenal in their 2-0 victory over Liverpool.
1969 - Manager of Manchester City as they won 1-0 against Leicester City.
9. Bob Stokoe
1955 - Played for Newcastle United in their 3rd win of the fifties as the Geordies defeated Manchester City (Don Revie, tracksuits and all) 3-1.
1973 - Manager of Sunderland as the Mackems famously defeated Revie's Leeds United with Ian Porterfield scoring the only goal.
10. Don Revie
1956 - Player for Manchester City as they made up for 1955's defeat by beating Birmingham City 3-1 in the game which is probably most famous for Bert Trautmann's having played on with a broken neck.
1972 - Manager of Leeds United as they comfortably beat Arsenal with a single Alan Clarke goal.
11. Terry Venables
1967 - Player as Spurs won the Cup for the third time in the decade by beating Chelsea 2-1.
1991 - Manager as Spurs defeated Nottingham Forest by 2-1 after extra time. The game is probably best remembered for Paul Gascoigne's departure from the field following his tackle on Forest's Gary Charles.