并非下表中的所有实体都能在所有的浏览器中正确地显示。
目前，IE 11 是唯一一个能正确显示所有 HTML5 实体的浏览器。
| 字符 | 实体名称 | 十六进制 |
|---|---|---|
| 'U | Uacute | 000DA |
| ú | uacute | 000FA |
| Uarr | 0219F | |
| uArr | 021D1 | |
| ↑ | uarr | 02191 |
| Uarrocir | 02949 | |
| Ubrcy | 0040E | |
| ubrcy | 0045E | |
| U | Ubreve | 0016C |
| u | ubreve | 0016D |
| ^U | Ucirc | 000DB |
| ^u | ucirc | 000FB |
| У | Ucy | 00423 |
| у | ucy | 00443 |
| udarr | 021C5 | |
| "U | Udblac | 00170 |
| "u | udblac | 00171 |
| udhar | 0296E | |
| ufisht | 0297E | |
| ? | Ufr | 1D518 |
| ? | ufr | 1D532 |
| `U | Ugrave | 000D9 |
| ù | ugrave | 000F9 |
| uHar | 02963 | |
| uharl | 021BF | |
| uharr | 021BE | |
| uhblk | 02580 | |
| ulcorn | 0231C | |
| ulcorner | 0231C | |
| ulcrop | 0230F | |
| ultri | 025F8 | |
| U | Umacr | 0016A |
| ū | umacr | 0016B |
| ¨ | uml | 000A8 |
| _ | UnderBar | 0005F |
| UnderBrace | 023DF | |
| UnderBracket | 023B5 | |
| UnderParenthesis | 023DD | |
| Union | 022C3 | |
| UnionPlus | 0228E | |
| U | Uogon | 00172 |
| u | uogon | 00173 |
| ? | Uopf | 1D54C |
| ? | uopf | 1D566 |
| ↑ | UpArrow | 02191 |
| Uparrow | 021D1 | |
| ↑ | uparrow | 02191 |
| UpArrowBar | 02912 | |
| UpArrowDownArrow | 021C5 | |
| UpDownArrow | 02195 | |
| Updownarrow | 021D5 | |
| updownarrow | 02195 | |
| UpEquilibrium | 0296E | |
| upharpoonleft | 021BF | |
| upharpoonright | 021BE | |
| uplus | 0228E | |
| ↖ | UpperLeftArrow | 02196 |
| ↗ | UpperRightArrow | 02197 |
| Υ | Upsi | 003D2 |
| υ | upsi | 003C5 |
| Υ | upsih | 003D2 |
| Υ | Upsilon | 003A5 |
| υ | upsilon | 003C5 |
| ⊥ | UpTee | 022A5 |
| UpTeeArrow | 021A5 | |
| upuparrows | 021C8 | |
| urcorn | 0231D | |
| urcorner | 0231D | |
| urcrop | 0230E | |
| U | Uring | 0016E |
| u | uring | 0016F |
| urtri | 025F9 | |
| ? | Uscr | 1D4B0 |
| ? | uscr | 1D4CA |
| utdot | 022F0 | |
| ~U | Utilde | 00168 |
| ~u | utilde | 00169 |
| utri | 025B5 | |
| utrif | 025B4 | |
| uuarr | 021C8 | |
| "U | Uuml | 000DC |
| ü | uuml | 000FC |
| uwangle | 029A7 |
