The women's heptathlon event at the 1988 World Junior Championships in Athletics was held in Sudbury, Ontario, Canada, at Laurentian University Stadium on 29 and 30 July.
| Gold | Svetla Dimitrova | |
| Silver | Yelena Petushkova | |
| Bronze | Peggy Beer |
29/30 July
| Rank | Name | Nationality | 100m H | HJ | SP | 200m | LJ | JT | 800m | Points | Notes | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| align=left | align=left | 13.47 (w: 1.1 m/s) | 1.77 | 13.07 | 23.78 (w: -1.6 m/s) | 6.45 | 39.98 | 2:14.39 | 6289 | |||||
| align=left | align=left | 13.55 (w: 1.1 m/s) | 1.80 | 13.27 | 24.86 (w: -1.6 m/s) | 5.90 | 41.68 | 2:13.29 | 6102 | |||||
| align=left | align=left | 13.65 (w: 1.1 m/s) | 1.77 | 13.13 | 24.45 (w: -0.8 m/s) | 6.17 | 38.06 | 2:15.02 | 6067 | |||||
| 4 | align=left | align=left | 13.98 (w: 1.5 m/s) | 1.68 | 12.44 | 24.91 (w: -0.9 m/s) | 6.06 | 47.10 | 2:20.94 | 5879 | ||||
| 5 | align=left | align=left | 13.88 (w: 1.6 m/s) | 1.74 | 13.24 | 25.11 (w: -0.8 m/s) | 5.69 | 42.86 | 2:23.74 | 5769 | ||||
| 6 | align=left | align=left |  | 13.61 | 1.77 | 13.11 | 25.45 | 5.36 | 39.00 | 2:18.95 | 5702 | |||
| 7 | align=left | align=left |  | 14.58 | 1.74 | 12.52 | 25.63 | 5.96 | 44.88 | 2:24.05 | 5693 | |||
| 8 | align=left | align=left |  | 13.86 | 1.86 | 11.75 | 25.62 | 5.58 | 35.94 | 2:24.65 | 5602 | |||
| 9 | align=left | align=left | 14.37 | 1.74 | 11.24 | 25.22 | 5.71 | 32.76 | 2:16.87 | 5466 | ||||
| 10 | align=left | align=left | 14.66 | 1.71 | 13.30 | 25.75 | 5.97 | 35.48 | 2:27.99 | 5459 | ||||
| 11 | align=left | align=left |  | 14.89 | 1.80 | 11.85 | 26.45 | 5.74 | 38.20 | 2:21.19 | 5454 | |||
| 12 | align=left | align=left | 14.76 | 1.68 | 13.26 | 24.85 | 6.20 | 22.26 | 2:19.24 | 5427 | ||||
| 13 | align=left | align=left |  | 14.73 | 1.71 | 12.45 | 26.55 | 6.00 | 40.90 | 2:30.08 | 5413 | |||
| 14 | align=left | align=left |  | 13.53 | 1.68 | 10.78 | 25.80 | 5.91 | 38.86 | 2:35.01 | 5327 | |||
| 15 | align=left | align=left | | 14.03 | 1.65 | 10.66 | 24.98 | 5.58 | 36.04 | 2:23.97 | 5315 | |||
| 16 | align=left | align=left |  | 15.01 | 1.71 | 11.13 | 25.36 | 5.43 | 31.68 | 2:19.91 | 5178 | |||
| 17 | align=left | align=left | 14.64 | 1.74 | 9.60 | 25.99 | 5.52 | 34.02 | 2:19.96 | 5177 | ||||
| 18 | align=left | align=left | | 14.47 | 1.62 | 11.38 | 25.96 | 5.59 | 34.82 | 2:26.66 | 5122 | |||
| 19 | align=left | align=left | 14.32 | 1.68 | 9.57 | 26.25 | 5.35 | 35.84 | 2:20.07 | 5108 | ||||
| align=left | align=left | 14.38 | 1.77 | 12.18 | 26.24 | DNS | DNS | DNS | DNF | |||||
| align=left | align=left | 14.56 | 1.65 | 9.91 | 26.19 | DNS | DNS | DNS | DNF | |||||
| align=left | align=left |  | 14.82 | 1.50 | DNS | DNS | DNS | DNS | DNS | DNF | ||||
| align=left | align=left |  | 16.97 | 1.68 | DNS | DNS | DNS | DNS | DNS | DNF |
According to an unofficial count, 23 athletes from 18 countries participated in the event.