I get nerdy about tiny details like this, so here’s the scoop: Julia Stiles is listed at about 5'5" (165 cm), which puts her in that comfortably average-but-a-bit-petite range. In practice that means she often stands noticeably shorter than her male leads. For example, in '10 Things I Hate About You' Heath Ledger towers over most of the cast (roughly around 6'1"), and Joseph Gordon-Levitt usually reads taller than Julia on screen (he’s commonly listed near 5'9"). In the Bourne films, Matt Damon also makes that male-lead height gap obvious when they share frames.
That said, she’s frequently around the same height as other women in her projects — Natalie Portman and some younger co-stars can look similar in stature, while actresses like Julia Roberts or Gabrielle Union sometimes appear a bit taller depending on footwear. Directors and costume teams also tweak posture, shoes, and camera angles, so height differences are softened when they need to be. Personally, I love how her presence never feels diminished by inches; she commands scenes regardless of who’s taller, which is the real win.