First Division Chelsea won the competition for the first time, first drawing with Leeds United 2–2 in the final at Wembley, before winning 2–1 in the replay at Old Trafford.
Matches were scheduled to be played at the stadium of the team named first on the date specified for each round, which was always a Saturday.
If scores were level after 90 minutes had been played, a replay would take place at the stadium of the second-named team later the same week.
Of the others, Walton & Hersham had last featured at this stage in 1957–58, Hillingdon Borough (known at the time as Yiewsley) had last done so in 1956-57 and Mossley had last done so in 1949-50.
The final two non-league sides in the main draw, North Shields and Sutton United were given byes to this stage as the champions and runners-up from the previous season's FA Amateur Cup.
Replay The semi-final matches were played on Saturday, 14 March 1970 with the Manchester United–Leeds United tie needing two replays to settle the contest over the following 12 days, with the tie needing 219 minutes to produce a goal.
[1] The 1970 FA Cup Final was contested by Leeds United and Chelsea at Wembley on the 11 April 1970.