Which came first, the Macintosh or Windows?

the Macintosh came first, by one year. Apple launched the first Macintosh, two days after the Super Bowl advert.

Side by side

the Macintosh

The Macintosh launched in January 1984 with a graphical interface and a mouse, and beat Windows to market by almost two years. Neither invented the idea — Xerox PARC had built the Alto in 1973, and both Apple and Microsoft were working from what they had seen there. Mac OS X, the ancestor of today's macOS, arrived much later in 2001 and is Unix underneath.

Windows

Windows 1.0 shipped in November 1985, twenty-two months after the Macintosh, and it was not an operating system — it was a graphical shell running on top of MS-DOS, and remained so until Windows NT in 1993 and the consumer transition with Windows XP in 2001. Version 1.0 could not even overlap windows: they tiled, because Apple's legal position on overlapping windows was unresolved.