List of UFC champions
Women's Strawweight Championship

No.
Name
Event
Date
Reign
Defenses
1
Carla Esparza
The Ultimate Fighter 20 Finale Las Vegas, NV, US
Dec 12, 2014
92 days
-
2
Joanna Jędrzejczyk
UFC 185 Dallas, TX, US
Mar 14, 2015
966 days
1. def.
3
Rose Namajunas
UFC 217 New York City, NY, US
Nov 4, 2017
529 days (incumbent)
1. def. Joanna Jędrzejczyk at UFC 223 on Apr 7, 2018

Question: Who has the longest title reign for the UFC Women's Strawweight Championship?
Answer: Joanna Jędrzejczyk holds the longest title reign of 966 days.