Z21
Z21或Z-21可以指：
- Z21/22次列车，北京至西藏拉萨之间的直达特快列车
- Z-21威廉·海德坎普号驱逐舰，德国驱逐舰
- ICD-10 第二十一章：影响健康状态和与保健机构接触的因素中，“无症状的人类免疫缺陷病毒感染状态”的编号
| Y21 | ||
| Z20 | Z21 | Z22 |
| Z21 | - | 21Z |
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