Agnes Marie Jacobina Zimmermann (5 July 1847  – 14 November 1925) was a German concert pianist and composer who lived in England.

Her family moved to England, and she was enrolled at the Royal Academy of Music at the age of nine, where her teachers were Charles Steggall and Cipriani Potter.

Zimmermann received the Kings Scholarship from 1860 to 1862 and made her public debut 1863 at The Crystal Palace playing Beethoven's Emperor Concerto.

Zimmermann was said to have given eighteen years of "devoted attention" to Goldsmid and it has been speculated that this was a lesbian relationship.

Several notable composers dedicated works to her, including George Alexander Macfarren's Three Sonatas (1880)[4] and Michele Esposito's Ballades, Op.