UK Box Office 23rd July, 2021
| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) |  | Black Widow (2021) | £1,410,288 | £2,621,109 | £13,830,117 | -22% | 3 |
| 2 (2) |  | Space Jam: A New Legacy (2021) | £1,397,044 | £2,249,587 | £3,613,143 | 2% | 2 |
| 3 (4) |  | The Croods: A New Age (2020) | £876,123 | £1,357,546 | £2,054,109 | 20% | 2 |
| 4 (new) |  | Old (2021) | £866,860 | £866,860 | £866,860 | new | 1 |
| 5 (3) |  | The Forever Purge (2021) | £598,803 | £1,080,753 | £1,800,785 | -17% | 2 |
| 6 (5) |  | Fast and Furious 9 (2021) | £437,074 | £784,557 | £14,932,205 | -2% | 5 |
| 7 (6) |  | Escape Room: Tournament of Champions (2021) | £174,210 | £392,408 | £670,505 | -37% | 2 |
| 8 (8) |  | Peter Rabbit 2: The Runaway (2021) | £159,341 | £266,548 | £18,882,487 | 44% | 10 |
| 9 (7) |  | A Quiet Place: Part II (2021) | £84,553 | £172,422 | £11,403,233 | -7% | 8 |
| 10 (new) | Off the Rails (2021) | £80,699 | £80,699 | £80,699 | new | 1 | |
| 11 (9) |  | In the Heights (2021) | £66,089 | £149,136 | £4,286,073 | -4% | 6 |
| 12 (11) |  | Cruella (2021) | £64,135 | £121,276 | £9,156,043 | 21% | 9 |
| 13 (10) |  | Summer of Soul (...Or, When the Revolution Could Not Be Televised) (2021) | £46,047 | £104,978 | £167,540 | -26% | 2 |
| 14 (13) |  | Another Round (2020) | £40,538 | £82,843 | £647,750 | -5% | 4 |
| 15 (12) |  | The Conjuring: The Devil Made Me Do It (2021) | £40,256 | £83,200 | £9,367,720 | -18% | 9 |
| 16 (14) |  | The Hitman's Wife's Bodyguard (2021) | £37,497 | £73,951 | £3,728,141 | 8% | 6 |
| 17 (19) |  | Tom & Jerry: The Movie (2021) | £30,245 | £37,367 | £1,113,455 | 69% | 10 |
| 18 (new) |  | Riders of Justice (2021) | £23,610 | £23,610 | £23,610 | new | 1 |
| 19 (18) |  | The Father (2021) | £13,469 | £34,192 | £2,010,020 | 28% | 7 |
| 20 (new) |  | The World to Come (2021) | £12,430 | £12,430 | £12,430 | new | 1 |
| 21 (17) |  | Supernova (2020) | £9,258 | £26,158 | £716,154 | -14% | 5 |
| 22 (new) |  | Night of the King's (2021) | £6,115 | £6,115 | £6,115 | new | 1 |
| 23 (22) | The Gruffalo and Zog (2021) | £5,155 | £6,832 | £68,229 | 60% | 6 | |
| 24 (new) | Girlfriends (2006) Rereleaase | £3,331 | £3,331 | £3,331 | RE | 1 | |
| 25 (30) |  | Bings Animal Stories (2021) | £2,793 | £3,681 | £33,536 | 66% | 4 |
| 26 (21) |  | Dream Horse (2021) | £1,922 | £7,411 | £704,035 | -30% | 8 |
| 27 (new) |  | I Never Cry (2020) | £1,140 | £1,140 | £1,140 | new | 1 |
| 28 (re) |  | My Beautiful Laundrette (1985) Rereleaase | £1,021 | £1,021 | £5,755 | RE | 12 |
| 29 (re) |  | Trainspotting (1996) Rerelease | £937 | £937 | £33,271 | RE | 13 |
| 30 (new) | Here We Are (2021) | £863 | £863 | £863 | new | 1 | |
| 31 (re) |  | After Love (2021) | £789 | £789 | £114,008 | RE | 6 |
| 32 (27) |  | Ammonite (2020) | £745 | £1,807 | £185,644 | -25% | 9 |
| 33 (34) |  | In the Earth (2021) | £669 | £1,449 | £155,590 | -4% | 6 |
| 34 (re) |  | Thomas & Friends: The Great Race (2016) | £652 | £652 | £302,365 | RE | 11 |
| 35 (42) | Akram Khan's Giselle: ENB 2017 (2018) | £573 | £820 | £121,371 | 62% | 11 | |
| 36 (28) | The Reason I Jump (2021) | £504 | £4,490 | £68,433 | -49% | 6 | |
| 37 (re) |  | Three Billboards Outside Ebbing, Missouri (2018) | £496 | £496 | £15,250,743 | RE | 21 |
| 38 (new) | Phil Liggett: The Voice of Cycling (2020) | £455 | £455 | £455 | new | 1 | |
| 39 (re) |  | The Lion King (2019) | £275 | £275 | £76,023,435 | RE | 37 |
| 40 (re) | Poly Styrene: I Am a Cliche (2021) | £275 | £275 | £2,668 | RE | 4 | |
| 41 (36) |  | Branagh Theatre Live: Romeo and Juliet 2016 (2016) | £241 | £1,682 | £856,020 | -59% | 13 |
| 42 (38) |  | Last Man Standing (1996) | £165 | £224 | £24,479 | -62% | 5 |
| 43 (re) |  | The Secret Garden (1994) | £153 | £153 | £741,856 | RE | 8 |
| 44 (re) | Sisters With Transistors (2021) | £103 | £103 | £3,812 | RE | 3 | |
| 45 (41) |  | The Witches (2020) | £63 | £63 | £27,338 | -78% | 10 |
| 46 (39) |  | Brassed Off (1996) Rereleaase | £61 | £973 | £4,930 | -82% | 15 |
| 47 (46) | Lady Boss: The Jackie Collins Story (2021) | £11 | £388 | £14,722 | -92% | 4 | |