Preheat your oven to 350°F (175°C). Line a baking sheet with parchment paper.
In a large mixing bowl, cream together the butter, brown sugar, and granulated sugar until smooth.
Beat in the eggs one at a time, then stir in the vanilla extract.
Combine the flour, baking soda, cinnamon, and salt; stir into the creamed mixture until just blended.
Mix in the oats and raisins. Drop by rounded spoonfuls onto the prepared baking sheet.
Bake for 10 to 12 minutes in the preheated oven, or until golden brown. Allow cookies to cool on baking sheet for 5 minutes before transferring to a wire rack to cool completely.