Adrien Broner -- I Need a Jail Pen Pal ... Please Write Me!

Don't be fooled by the fun-loving inmates in "Orange Is the New Black" -- jail can be a VERY boring place ... which is why Adrien Broner is asking for pen pals to help pass the time!

TMZ Sports broke the story ... the boxer was taken into custody in Ohio Tuesday to serve a 10 day sentence for violating his probation in his reckless driving case.

Well, he's 24 hours in ... and he's officially asked the public to hit him up with letters. In fact, Broner even posted the address of the Hamilton County Justice Center to make it easier to correspond.

Adrien Broner
#1596222
Hamilton County Justice Center
900 Sycamore St., Cincinnati, OH 45202