Meir Leibush ben Yehiel Michel Wisser (March 7, 1809 – September 18, 1879), better known as the Malbim (Hebrew: מלבי"ם), was a rabbi, master of Hebrew grammar, and Bible commentator. The name Malbim was derived from the Hebrew initials of his name. He used this acronym as his surname in all his published works and became known by it in common usage. His writings do not include works about Kohelet or Eicha.

Malbim was born in Volochysk, Volhynia, to Yehiel Michel Wisser. His father educated him in Hebrew and the Talmud. After being orphaned as a child, Meïr was cared for and educated by his stepfather, Rabbi Leib of Volochysk.

At the age of 13, he went to study in Warsaw where he became known as "the Illui from Volhynia." At age fourteen, he married but shortly thereafter divorced. The Malbim showed talent from his early childhood, and his works indicate that he had considerable knowledge of secular sciences and history. From 1838 to 1845, he served as rabbi of Wreschen. In the latter year, he was called to the rabbinate of Kempen, where he remained until 1859. He was thereafter also known as der Kempener Magid.

His first major work, published at age 25, was Artzas HaChaim—a commentary on Orach Chaim.

In 1859, Malbim became chief rabbi of Bucharest, Romania. He had disagreements with the upper class and educated Jews there; some of them Austrian citizens (called in Romanian sudiţi) led by the noted Dr. Iuliu Barasch. They wanted to introduce changes in the spirit of modern European life into the life of the local Jewry as was done in some Reform congregations. Malbim defended the traditional style of Orthodox Judaism, which demanded strict adherence to Jewish law and tradition. He rejected almost all suggestions to edit the Siddur, give up beards or other distinctions of exterior appearance, or make other changes in observance.

Malbim opposed the construction of the Choral Temple which would be equipped with a choir and organ similar to the Great Synagogue of Leopoldstadt in Vienna. He thought this was too Christian in style. In 1864, the Choral Temple became the main neo-orthodox synagogue in Romania. He also condemned the founding (before he arrived) of the first two elementary schools in Bucharest for Jewish children to offer a general knowledge curriculum. In this period, Romanian officials encouraged such efforts to integrate the Jews into mainstream Romanian life.

Malbim's insistence on adhering to the halakha, such as daily inspection of butcher's knives, resulted in portions of the religious personnel (e.g., shochtim and dayanim) becoming hostile toward him. Through their frequent complaints, his opponents almost succeeded in having him sent to prison. Malbim was freed through the intervention of Sir Moses Montefiore upon the condition that he leave Romania.

Malbim went to Constantinople and complained to the Turkish government but obtained no satisfaction. After staying six months in Paris, he went to Lunshitz, in Russian Poland, as successor to his deceased father-in-law, Hayyim Auerbach (1866). Shortly afterward, he became rabbi at Kherson and thence was called to the rabbinate of Mogilev on the Dnieper (1870). There, too, he was a staunch supporter of Judaism and was resented by the richer Jews; they denounced him as a political criminal, and the governor of Moghilev forced him to leave the town.