| Title | Weekend | Week | Total | % Change | Total Weeks |
| 1 (3) |  | A Star Is Born (2018) | £3,083,089 | £5,495,474 | £9,595,670 | -25% | 2 |
| 2 (1) |  | Venom (2018) | £3,002,032 | £5,698,475 | £13,729,817 | -63% | 2 |
| 3 (2) |  | Johnny English Strikes Again (2018) | £2,900,426 | £4,199,510 | £8,317,202 | -30% | 2 |
| 4 (new) |  | First Man (2018) | £2,415,330 | £2,415,330 | £2,415,330 | new | 1 |
| 5 (new) |  | Smallfoot (2018) | £2,324,189 | £2,324,189 | £2,324,189 | new | 1 |
| 6 (new) |  | Cliff Richard Live 60th Anniversary Tour (2018) | £1,123,885 | £1,123,885 | £1,123,885 | new | 1 |
| 7 (new) |  | Kler (2018) | £1,006,141 | £1,006,141 | £1,006,141 | new | 1 |
| 8 (new) |  | Bad Times At the El Royale (2018) | £491,878 | £491,878 | £491,878 | new | 1 |
| 9 (4) |  | The House With a Clock In Its Walls (2018) | £399,028 | £601,620 | £7,408,371 | -56% | 4 |
| 10 (5) |  | Night School (2018) | £357,617 | £705,709 | £3,828,627 | -58% | 3 |
| 11 (6) |  | A Simple Favour (2018) | £153,247 | £455,115 | £4,930,383 | -68% | 4 |
| 12 (11) |  | Incredibles 2 (2018) | £148,988 | £159,713 | £55,924,175 | -32% | 14 |
| 13 (10) |  | The Wife (2018) | £114,329 | £308,841 | £1,232,864 | -50% | 3 |
| 14 (8) |  | Crazy Rich Asians (2018) | £93,833 | £220,953 | £5,624,525 | -67% | 5 |
| 15 (9) |  | The Nun (2018) | £85,081 | £202,436 | £11,302,155 | -65% | 6 |
| 16 (12) |  | King of Thieves (2018) | £53,007 | £216,682 | £5,796,292 | -73% | 5 |
| 17 (14) |  | Christopher Robin (2018) | £40,828 | £68,316 | £14,485,722 | -72% | 9 |
| 18 (new) | | Rosie (2018) | £31,458 | £31,458 | £31,458 | new | 1 |
| 19 (new) |  | Mandy (2018) | £30,556 | £30,556 | £30,556 | new | 1 |
| 20 (new) | | Helicopter Eela (2018) | £25,904 | £25,904 | £25,904 | new | 1 |
| 21 (17) |  | Mamma Mia! Here We Go Again (2018) | £24,239 | £64,704 | £65,441,404 | -61% | 13 |
| 22 (19) | | The Intent 2: The Come Up (2018) | £14,390 | £30,687 | £419,722 | -55% | 4 |
| 23 (23) |  | Cold War (2018) | £9,754 | £27,893 | £1,054,835 | -59% | 7 |
| 24 (22) |  | The Little Stranger (2018) | £8,965 | £30,864 | £732,507 | -65% | 4 |
| 25 (re) | | King Lear: NT Live 2018 (2018) | £6,743 | £6,743 | £633,764 | re | 2 |
| 26 (new) |  | Make Me Up (2018) | £6,583 | £6,583 | £6,583 | new | 1 |
| 27 (new) | | 1945 (2018) | £5,829 | £5,829 | £5,829 | new | 1 |
| 28 (new) | | Son of Manjeet Singh (2018) | £5,458 | £5,458 | £5,458 | new | 1 |
| 29 (29) |  | The Children Act (2018) | £5,288 | £40,560 | £2,782,881 | -56% | 8 |
| 30 (32) |  | Yardie (2018) | £4,522 | £8,178 | £1,144,498 | -37% | 7 |
| 31 (36) | | Grace and Goliath (2018) | £2,850 | £5,311 | £9,841 | -37% | 2 |
| 32 (27) |  | Mission:Impossible - Fallout (2018) | £2,499 | £9,726 | £24,383,169 | -84% | 12 |
| 33 (44) |  | Sherlock Gnomes (2018) | £2,221 | £2,222 | £9,452,264 | 57% | 23 |
| 34 (new) |  | Aravinda Sametha Veera Raghava (2018) | £2,046 | £2,046 | £2,046 | new | 1 |
| 35 (re) |  | The Importance of Being Earnest 2018 (2018) | £1,671 | £1,671 | £333,127 | re | 1 |
| 36 (31) | | Matangi / Maya / M.I.A. (2018) | £1,625 | £11,331 | £124,771 | -79% | 4 |
| 37 (41) | | Hurricane (2018) | £1,147 | £3,682 | £123,981 | -27% | 6 |
| 38 (37) | | Redcon 1 (2018) | £1,118 | £3,341 | £15,309 | -67% | 3 |
| 39 (48) |  | Thomas & Friends: Big World Big Adventures: The Movie (2018) | £980 | £980 | £499,954 | 32% | 13 |
| 40 (new) |  | Sink (2018) | £975 | £975 | £975 | new | 1 |
| 41 (50) | | Swimming With Men (2018) | £894 | £3,873 | £466,223 | 58% | 15 |
| 42 (re) |  | Everybody's Talking About Jamie (2018) | £635 | £635 | £726,767 | re | 11 |
| 43 (34) | | Nureyev (2018) | £524 | £4,242 | £70,580 | -90% | 4 |
| 44 (new) | | S.P.L.I.T. (2018) | £414 | £414 | £414 | new | 1 |
| 45 (new) | | Pili (2018) | £335 | £335 | £335 | new | 1 |
| 46 (re) |  | Leaning Into the Wind - Andy Goldsworthy (2018) | £329 | £329 | £39,410 | re | 8 |
| 47 (51) | | The More You Ignore Me (2018) | £318 | £674 | £69,040 | -8% | 15 |
| 48 (57) |  | Peter Rabbit (2018) | £306 | £209 | £41,074,970 | 50% | 31 |
| 49 (new) | | Mayerling: ROH London 2018/19 (2018) | £273 | £273 | £273 | new | 1 |
| 50 (40) | | Sgt. Stubby: An Unlikely Hero (2018) | £244 | £244 | £119,018 | -91% | 10 |
| 51 (47) |  | The Festival (2018) | £224 | £641 | £3,439,025 | -70% | 9 |
| 52 (re) |  | Spitfire (2018) | £195 | £195 | £277,357 | re | 12 |
| 53 (55) | | Patrick (2018) | £190 | £8,498 | £1,238,466 | 11% | 16 |
| 54 (42) | | Strangeways Here We Come (2018) | £160 | £1,138 | £2,640 | -89% | 2 |
| 55 (56) |  | Jurassic World: Fallen Kingdom (2018) | £127 | £13,970 | £41,601,773 | -19% | 19 |
| 56 (re) | | The Man From Mowax (2018) | £107 | £107 | £19,387 | re | 5 |
| 57 (re) | | The Escape (2018) | £105 | £105 | £166,572 | re | 10 |
| 58 (61) | | The Eyes of Orson Welles (2018) | £93 | £282 | £34,744 | 61% | 9 |
| 59 (58) |  | The Guernsey Literary and Potato Peel Pie Society (2018) | £91 | £1,307 | £5,937,280 | 2% | 23 |
| 60 (43) |  | Apostasy (2018) | £90 | £-1,425 | £330,182 | -92% | 12 |
| 61 (new) |  | Us and Them (2018) | £37 | £37 | £37 | new | 1 |