Søren Peder Lauritz Sørensen (9 January 1868 - 12 February 1939) was a Danish chemist, famous for the introduction of the concept of pH, a scale for measuring acidity and basicity. He was born in Havrebjerg, Denmark.

From 1901 to 1938 he was head of the prestigious Carlsberg Laboratory, Copenhagen.^[1] While working at the Carlsberg Laboratory he studied the effect of ion concentration on proteins,^[2] and because the concentration of hydrogen ions was particularly important, he introduced the pH-scale as a simple way of expressing it in 1909.^[3] The article in which he introduced the scale (using the notation p_H^[4]), described two new methods for measuring acidity.^[5] The first method was based on electrodes, while the second involved comparing the colors of samples and a preselected set of indicators.

He is also known for the Sørensen formol titration.

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