Hōan (保安) was a Japanese era name (年号,, nengō,; lit. "year name") after Gen'ei and before Tenji. This period spanned the years from April 1120 through April 1124. The reigning emperors were Toba-tennō (鳥羽天皇) and Sutoku-tennō (崇徳天皇).
| Hōan | 1st | 2nd | 3rd | 4th | 5th |
| Gregorian | 1120 | 1121 | 1122 | 1123 | 1124 |
| Preceded by: Gen'ei |
Era or nengō: Hōan |
Succeeded by: Tenji |