This is a list of films which placed number one at the weekly box office in the United States during 1948 per Varietys weekly National Boxoffice Survey. The results are based on a sample of 20-25 key cities and therefore, any box office amounts quoted may not be the total that the film grossed nationally in the week.
| Week ending | Film | Notes | ||
|---|---|---|---|---|
| 1 | Captain from Castile | |||
| 2 | Road to Rio | Road to Rio reached number one in its third week of release | [1] | |
| 3 | [2] | |||
| 4 | The Treasure of the Sierra Madre | Treasure of the Sierra Madre reached number one in its second week of release. | [3] | |
| 5 | [4] | |||
| 6 | You Were Meant for Me | You Were Meant for Me reached number one in its second week of release | [5] | |
| 7 | To the Ends of the Earth | [6] | ||
| 8 | The Voice of the Turtle | The Voice of the Turtle reached number one in its ninth week of release | [7] | |
| 9 | Call Northside 777 | Call Northside 777 reached number one in its third week of release with a gross of $500,000 from 17 cities. | [8] | |
| 10 | [9] | |||
| 11 | Saigon | [10] | ||
| 12 | Gentleman's Agreement | [11] | ||
| 13 | Sitting Pretty | Sitting Pretty reached number one in its third week of release | [12] | |
| 14 | The Naked City | The Naked City reached number one in its fifth week of release. | [13] | |
| 15 | [14] | |||
| 16 | I Remember Mama | I Remember Mama reached number one in its sixth week of release | [15] | |
| 17 | The Big Clock | The Big Clock reached number one in its third week of release | [16] | |
| 18 | State of the Union | State of the Union grossed $578,000 from 21 key cities | [17] | |
| 19 | [18] | |||
| 20 | The Iron Curtain | The Iron Curtain grossed over $500,000 from 20 key cities. | [19] | |
| 21 | [20] | |||
| 22 | Homecoming | Homecoming reached number one in its fifth week of release. | [21] | |
| 23 | [22] | |||
| 24 | [23] | |||
| 25 | [24] | |||
| 26 | The Emperor Waltz | The Emperor Waltz reached number one in its fifth week of release | [25] | |
| 27 | The Emperor Waltz grossed over $400,000 for the week. | [26] | ||
| 28 | The Emperor Waltz grossed $379,000 for the week. | [27] | ||
| 29 | [28] | |||
| 30 | Easter Parade | Easter Parade reached number one in its fourth week of release | [29] | |
| 31 | Key Largo | [30] | ||
| 32 | [31] | |||
| 33 | [32] | |||
| 34 | A Date with Judy | A Date with Judy reached number one in its fourth week of release. | [33] | |
| 35 | [34] | |||
| 36 | [35] | |||
| 37 | [36] | |||
| 38 | Rachel and the Stranger | [37] | ||
| 39 | [38] | |||
| 40 | Sorry, Wrong Number | [39] | ||
| 41 | [40] | |||
| 42 | Johnny Belinda | [41] | ||
| 43 | Apartment for Peggy | [42] | ||
| 44 | Red River | [43] | ||
| 45 | A Song Is Born | [44] | ||
| 46 | Road House | [45] | ||
| 47 | Julia Misbehaves | [46] | ||
| 48 | When My Baby Smiles at Me | When My Baby Smiles at Me grossed nearly $560,000 from 19 key cities in its fourth week of release. | [47] | |
| 49 | The Three Musketeers | [48] | ||
| 50 | When My Baby Smiles at Me | When My Baby Smiles at Me returned to number one in its sixth week of release. | [49] | |
| 51 | The Paleface | [50] | ||
| 52 | [51] |