| Title | Weekend | Week | Total | % Change | Total Weeks | ||
| 1 (1) | ![]() | Bohemian Rhapsody (2018) | £5,750,267 | £10,897,403 | £20,427,866 | -40% | 2 |
| 2 (2) | ![]() | A Star Is Born (2018) | £1,821,004 | £3,691,163 | £22,929,874 | -15% | 5 |
| 3 (new) | ![]() | The Nutcracker and the Four Realms (2018) | £1,733,235 | £1,733,235 | £1,733,235 | new | 1 |
| 4 (4) | ![]() | Smallfoot (2018) | £1,145,377 | £2,483,066 | £10,174,311 | -27% | 4 |
| 5 (5) | ![]() | Johnny English Strikes Again (2018) | £1,041,621 | £2,206,601 | £16,379,395 | -33% | 5 |
| 6 (6) | ![]() | Goosebumps 2: Haunted Halloween (2018) | £867,848 | £2,191,327 | £7,109,456 | -37% | 3 |
| 7 (3) | ![]() | Halloween (2018) | £790,143 | £2,317,216 | £8,171,544 | -53% | 3 |
| 8 (8) | ![]() | Venom (2018) | £509,204 | £1,080,922 | £19,532,938 | -41% | 5 |
| 9 (new) | ![]() | Slaughterhouse Rulez (2018) | £397,792 | £397,792 | £397,792 | new | 1 |
| 10 (new) | ![]() | Peterloo (2018) | £348,697 | £348,697 | £348,697 | new | 1 |
| 11 (9) | ![]() | First Man (2018) | £348,441 | £801,088 | £7,360,906 | -42% | 4 |
| 12 (7) | ![]() | The Hate U Give (2018) | £199,141 | £547,201 | £1,458,510 | -78% | 2 |
| 13 (new) | 7 Uczuk (2018) | £139,816 | £139,816 | £139,816 | new | 1 | |
| 14 (12) | ![]() | Hotel Transylvania 3: Summer Vacation (2018) | £90,076 | £247,685 | £19,916,527 | -51% | 13 |
| 15 (13) | ![]() | The House With a Clock In Its Walls (2018) | £78,130 | £218,591 | £8,265,725 | -47% | 7 |
| 16 (new) | Mirai (2018) | £70,643 | £70,643 | £70,643 | new | 1 | |
| 17 (new) | Juliet, Naked (2018) | £51,813 | £51,813 | £51,813 | new | 1 | |
| 18 (19) | ![]() | They Shall Not Grow Old (2018) | £34,313 | £148,866 | £862,452 | -14% | 3 |
| 19 (18) | ![]() | The Wife (2018) | £28,104 | £75,135 | £1,574,642 | -30% | 6 |
| 20 (47) | ![]() | Sherlock Gnomes (2018) | £24,918 | £25,142 | £9,478,051 | 100% | 26 |
| 21 (re) | ![]() | Allelujah: NT Live 2018 (2018) | £22,384 | £22,384 | £675,089 | re | 1 |
| 22 (new) | ![]() | League of Legends World Championship Finals 2018 (2018) | £22,221 | £22,221 | £22,221 | new | 1 |
| 23 (new) | Nae Pasaran! (2018) | £15,591 | £15,591 | £15,591 | new | 1 | |
| 24 (new) | ![]() | Some Like It Hot (1959) Rerelease | £15,261 | £15,261 | £15,261 | re | 1 |
| 25 (25) | ![]() | Funny Girl: The Musical (2018) | £12,092 | £40,365 | £572,799 | -6% | 2 |
| 26 (27) | ![]() | Cold War (2018) | £10,614 | £17,540 | £1,107,439 | 17% | 10 |
| 27 (22) | ![]() | King of Thieves (2018) | £10,433 | £40,758 | £5,984,546 | -57% | 8 |
| 28 (new) | Savyasachi (2018) | £8,661 | £8,661 | £8,661 | new | 1 | |
| 29 (31) | ![]() | Cliff Richard Live 60th Anniversary Tour (2018) | £7,971 | £28,486 | £1,211,342 | 41% | 4 |
| 30 (new) | Black Mother (2018) | £5,519 | £5,519 | £5,519 | new | 1 | |
| 31 (20) | ![]() | Christopher Robin (2018) | £4,875 | £43,614 | £14,782,780 | -87% | 12 |
| 32 (re) | Sgt. Stubby: An Unlikely Hero (2018) | £3,774 | £3,774 | £123,235 | re | 12 | |
| 33 (26) | ![]() | Possum (2018) | £3,142 | £7,864 | £16,901 | -65% | 2 |
| 34 (new) | ![]() | Matriarch (2018) | £2,403 | £2,403 | £2,403 | new | 1 |
| 35 (36) | ![]() | Mamma Mia! Here We Go Again (2018) | £2,318 | £18,911 | £65,515,994 | -18% | 16 |
| 36 (new) | No Shade (2018) | £2,315 | £2,315 | £2,315 | new | 1 | |
| 37 (38) | King Lear: NT Live 2018 (2018) | £2,219 | £4,797 | £715,487 | -3% | 5 | |
| 38 (34) | ![]() | The Little Stranger (2018) | £1,263 | £8,636 | £769,487 | -65% | 7 |
| 39 (37) | The Intent 2: The Come Up (2018) | £1,187 | £1,900 | £441,235 | -56% | 7 | |
| 40 (11) | ![]() | Die Walküre: ROH London 2018 Opera (2018) | £1,132 | £13,271 | £198,337 | -99% | 2 |
| 41 (49) | Nureyev (2018) | £989 | £1,489 | £74,375 | 93% | 7 | |
| 42 (re) | ![]() | Everybody's Talking About Jamie (2018) | £980 | £980 | £727,747 | re | 12 |
| 43 (re) | ![]() | The Happy Prince (2018) | £737 | £737 | £871,037 | re | 16 |
| 44 (44) | Grace and Goliath (2018) | £638 | £1,743 | £14,623 | 24% | 5 | |
| 45 (43) | ![]() | Yardie (2018) | £343 | £738 | £1,149,738 | -38% | 10 |
| 46 (new) | King of Crime (2018) | £170 | £170 | £170 | new | 1 | |
| 47 (39) | ![]() | The Children Act (2018) | £166 | £12,907 | £2,819,735 | -91% | 11 |
| 48 (new) | Rashtraputra (2018) | £125 | £125 | £125 | new | 1 | |
| 49 (46) | Redcon 1 (2018) | £114 | £334 | £18,092 | -7% | 6 | |
| 50 (35) | The Necromancer (2018) | £46 | £2,919 | £6,046 | -99% | 2 | |
| 51 (45) | ![]() | Mission:Impossible - Fallout (2018) | £28 | £359 | £24,393,734 | -90% | 15 |