The school had 96 people enrolled last year and 121 in 2018.
Most classes for the year are full, with some spaces still available at intermediate level, UCOL's Executive Dean Humanities and Business, Dean Rankin, said.
"We are seeing large increases in people interested in learning te Reo Māori across all our campuses, and many organisations are also encouraging and supporting their staff to learn.
"We have put on more classes than last year, and have a constant number of people enquiring about learning te Reo Māori.
"The classes are free to attend as they are funded from the governments' Adult and Community Education fund. Due to popular demand, the funding targets for UCOL for Adult and Community Education have been achieved for 2018 with only a few classes remaining this year."
Planning was currently under way for more classes at UCOL to meet this demand in 2019.