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| Foster Lambert | |
| Continuity: | Insidious film series |
| Notability: | Minor character |
| Type: | Child |
| Gender: | Male |
| Race: | Human |
| Location: | Lambert residence, California |
| Relatives: | Josh Lambert Renai Lambert Dalton Lambert Kali Lambert Lorraine Lambert |
| Status: | Alive |
| First: | Insidious |
| Actor: | Andrew Astor |
Foster Lambert is a fictional child and a minor character featured in the Insidious film series created by James Wan and Leigh Whannell. Played by actor Andrew Astor, he first appeared in the first installment of the series, Insidious in 2010.