Lars Ivar Samuelson (born 20 December 1948) is a Swedish physicist and professor in nanotechnology and semiconductor electronics[6] at Lund University.

In 1988 he became a professor of semiconductor electronics at the Department of Physics at Lund University, and in the same year initiated the creation of Scandinavia's first Nanoscience research center, Nanometer structure consortium (nmC).

In 2002, he became one of the first in the world to show how to combine substances with different structural, electrical and optical properties in a nanowire.

[8] Since 2021, he is employed as a professor at Southern University of Science and Technology[9] in Shenzhen, leading the Institute of Nanoscience and Applications (INA).

He is ranked third on the journal Nano Letters list of the most productive researchers in nanosciences in the years 2001–2009.