The 29-year-old actress had the number "5" inked on her side in reference to Monteith's Glee character, Finn Hudson. Finn was a high school quarterback who wore the number 5 football jersey.
"And one more.. for my Quarterback.. #5," Michele captioned a photo of her tattoo on Instagram.
The Glee actress also got a tattoo of a coffee cup to honor her grandmother, who died this week. She remembered her grandma as an atypical but "beautiful" person who "said something inappropriate" to every boyfriend she's ever had.
Michele, who played Rachel Berry on Glee, was dating Monteith when he died of an accidental drug overdose at age 31 in 2013. She dedicated songs to the actor on her 2014 album Louder and commemorates him each year on his birthday.
"[My mom] told me there is an empowerment that comes with grief -- at some point you find it," she said on The Ellen DeGeneres Show in 2013. "I think at a certain point you can choose to sort of fall from this or you can choose to rise."
"I'm just trying to do my best for him because I know that's what he would have wanted," she shared. "To just do my best and hopefully make something positive for where I go in the rest of my life."
Michele has since dated Matthew Paetz but split from her beau in February. The actress will reprise Hester Ulrich on Season 2 of Fox series Scream Queens.