Jacobina Mentz Maurer (June 1841 or 1842 in Novo Hamburgo – August 2, 1874 in Sapiranga) was a Brazilian religious leader.

Their daughter, Jacobina Mentz, was born in Brazil and raised in what is today known as Novo Hamburgo, Rio Grande do Sul, in a rural community composed of religious German immigrants, with both Lutheran and Catholic members.

Jacobina suffered from fainting attacks since she was 12 years old and people associated her sleepwalking situation with special powers.

Many people left the local Catholic or Lutheran churches and established a fanatical sect, with Jacobina being their leader.

Conflicts between the followers of Jacobina (Muckers) and their enemies (Spotters) increased when people began to buy weapons.

On December 10, 1873 João Maurer, along with two other members, went to then Brazil's capital, Rio de Janeiro, to deliver a petition to the Emperor Pedro II, complaining of police harassment, beatings and insults and moral heritage against other settlers.

The revolt ended on August 2 of that year, when a traitor, Carlos Luppa, led the police to Jacobina's hideout.

On October 23–24, 1897 three people were killed and the crime was attributed to the Muckers led by Aurélia Maurer, the daughter of Jacobina.

In 2002, filmmaker Fábio Barreto reproduced the Revolt in the movie A Paixão de Jacobina, with actress Letícia Spiller in the lead role.