These are the primary hubs where users upload various versions (SDH for hearing impaired, forced subtitles, etc.).
For a written "write-up" of the dialogue rather than a timed subtitle file: North by Northwest subtitles English
You can find the full movie script here, which mirrors the dialogue found in subtitles. These are the primary hubs where users upload
If you already have the film file and need a separate subtitle file (SRT format), community-driven databases are the most common starting point: Modern releases of the film are almost guaranteed
You can browse the full movie script online at Script Slug for quick reference to specific lines.
Modern releases of the film are almost guaranteed to include high-quality, professional English subtitles:
Services like Max, Amazon Prime, or Apple TV (availability varies by region) include official English subtitles as a standard feature. Script & Dialogue Resources