- "Your grandfather Allen, rest his soul, was a sweet man, but he led me straight down the hippie-dippie trail."
- ―Penny Halliwell
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| Allen Halliwell | |
| Continuity: | Charmed |
| Notability: | Minor character |
| Gender: | Male |
| Race: | Human |
| Location: | San Francisco, California |
| Status: | Deceased |
| First: | "Witchstock" |
| Actor: | Patrick Cassidy |
Allen Halliwell is a minor character featured in the WB Network television series Charmed. Played by actor Patrick Cassidy, he appeared in the 1969 time-travel episode "Witchstock" in season six.