Need to restore my contacts in my iPhone

There is a small chance (depending on what you have/have not told us) you may be able to restore your contacts from your latest iPhone backup. (You do back up your iPhone, right?)

Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

Where might you house your contacts? The answer will determine if it’s even possible to restore contacts, and, if so, how.

You should also tell us much more about the disappearance. How might it have happened, how many contacts, what else was happening, etc.

Hello,

In addition to sberman's comments, see if this might help:

Restore contacts, calendars, bookmarks, and more using iCloud.com - Apple Support

Good luck.