Joanna Koerten, (married name Joanna Block) (17 November 1650 in Amsterdam – 28 December 1715 in Amsterdam) was a Dutch artist who excelled in painting, drawing, embroidery, glass etching, and wax modeling. She achieved fame as a silhouette cutter, the art of creating outline images from pieces of cut paper mounted on a contrasting background. She produced landscapes, seascapes, flowers, portraits, and religious scenes in this medium. Her clients included Peter the Great of Russia, Frederick Elector of Brandenburg, Johan de Witt and William III of England.
She was the daughter of Jan Koerten (1622–1651), a Baptist cloth merchant, and his wife Ytje Cardinaels (d. before October 25, 1691). Her father died when she was one year old. Her mother remarried Rosijn Zacharias in 1659, also a cloth merchant. Joanna only married in 1691 after her mother and stepfather had died, when she was 41 years old. Her husband was Adrian Block, who, just like her father and stepfather, was a cloth merchant. He was of Mennonite background. They had no children.
From a young age she sat apart from other children and showed an interest in depicting what she saw around her, things both animate and inanimate.
She gained fame as an artist working out of her husband's shop at No. 137 Nieuwendijk Amsterdam, which served as a gallery of her work. Peter the Great honored her with a visit in 1697 in the company of Mayor Witsen. According to Houbraken, she could carve scenes on glass with a diamond, embroider and weave silk creations, pouring wax creations, lace-making and watercolor painting.
After her death her gallery continued as a place of interest to artists and a visitors book kept by her surviving husband shows the names of many notable artist and poet visitors, both during her lifetime and beyond. Among them are artists Gerard de Lairesse, Melchior Hondecoeter and Nicholas Verkolje; calligraphers Jacob Gadelle, and Mary Strick; and poets David van Hoogstraten, John Brandt, Gesine Brit and Katharina Lescailje.
Koerten's paper cutting technique imitates the high art characteristics of oil painting and sculpture of the 17th century. She focused to create the effect of the textural and perspectival nature of painting while at the same time achieving the monumental nature of sculpture. She emphasized the pictorial and illusionistic aspects of paper cutting, making her an innovative artist of her time as compared to typical paper cut art with delicate interlaced and calligraphic strands. She used a wide variety of cut shapes to more accurately imitate the appearance of gradually chiaroscuro, similar to painting. In her portrait of Peter the Great (c.1697), she portrays varying textures and contrast shown in the rough stonework through small slits as well as in Peter's armor shining in dark wedge cuttings contrasting against the white paper. Peter's fur ermine cape utilizes cutting techniques created with sharp spiked cuts, soft molded carvings, and short, ragged snips. Koerten's Frederik III shows linework depicting a deeper illusion of interior space in her use of linear perspective. Textured stonework and shimmering fabrics are also shown in this work along with curved, sweeping cuts resembling the appearance of hair. 
Only fifteen of her works survive. The existence of others can be inferred from descriptions in old auction lists.
For a description of her oeuvre see: Catalogus van een overheerlijk konstkabinet papiere snykonst, door wylen Mejuffrouw Koerten, huisvrouw van wylen Adriaan Blok, met de schaar in papier gesneden (Amsterdam ca.1750).
- Joanna Koerton at the Dinner Party database of notable women. Brooklyn Museum. Accessed April 2011.
- Koerten, Joanna Huygens Institute for Dutch History, 07/04/2009 . Accessed April 2011
- Joanna Koerten Foundation Digital Library for Dutch Literature (DBNL). Accessed April 2011
- May Our Daughters listen , in May her likes be multiplied: biography and gender politics in Egypt by Marilyn Booth, University of California Press, 2001, ISBN 0-520-22420-5. Accessed April 2011
- Koerten, Joanna Woman's record, or, Sketches of all distinguished women: from the creation to A.D. 1854 . Sarah Josepha Buell Hale, Harper & Bros., 1855
- (in Dutch) Johanna Koerten Biography in De groote schouburgh der Nederlantsche konstschilders en schilderessen (1718) by Arnold Houbraken, courtesy of the Digital library for Dutch literature
- Johanna Koerten in the RKD
- Peacock, Martha Moffitt (2012). "Paper as power: Carving a niche for the female artist in the work of Joanna Koerten". Nederlands Kunsthistorisch Jaarboek. Netherlands Yearbook for History of Art. The Netherlands: Koninklijke Brill NV, Leiden: 251–254. ISSN 0169-6726.
Biographies about Joanna Koerten:
- Joanna Koerten Universal biography by John Lemprière, Publisher E. Sargeant, 1810
- AJ van der Aa, Biographical Dictionary of the Netherlands. Volume 10 (1862)
- PJ Block and PC Molhuysen, New Netherland biographical dictionary. Volume 10 (1937)
- K. ter Laan, Literary Dictionary for North and South (1952)
Media related to Joanna Koerten at Wikimedia Commons