The Day of the Doctor was watched by 10.2 million viewers in the UK according to unofficial overnight figures.
The 50th Anniversary story achieved an audience share of 37.4% of the total television audience, beating ITV's The X Factor, which had 7.7 million watching.
Doctor Who was the second most-watched show of the day, with Strictly Come Dancing just edging into first place with 10.6 million viewers. ITV's other big hitter, I'm a Celebrity... Get Me Out of Here!, came in at number 4 with 9.2 million watching. 5th for the day was a special Doctor Who-themed edition of Pointless Celebrities which had 5.0 million viewers.
Doctor Who is currently the third most-watched programme for the week.
The figures include those who watched the show live on BBC One, or who recorded it and watched it before 2am. They do not include those watching on iPlayer or at any of the multiple cinema showings.
Final official figures will be released next week.