Is LGA 1200 compatible with 1155 Socket?

Florin said:

I would like to know if an i3-10100 LGA 1200 is compatible with my DDR3 motherboard that has 1155 Socket. I'm not interested about the cooler, I am interested if it will fit the socket.

NO.

November 23, 2020
The oldest socket we’ll cover in this guide, Intel’s LGA 1155 arrived alongside the second generation of Intel Core processors. The socket served as the mainstream option, so most of Intel’s Sandy Bridge line of CPUs is compatible with it. High-end processors, like Intel’s six-core models (called Sandy Bridge-E), are the exception; we’ll talk about their socket next.

LGA 1155 is a cross-generation socket. Though built for Sandy Bridge (Intel Core second-gen), it also accepts Ivy Bridge (Intel Core third-gen) processors, which means that owners of an old LGA 1155 motherboard absolutely have some upgrade options available. Upgrading from an old Sandy Bridge dual-core to an Ivy Bridge quad (like the Core i5-3450, for example) can provide a major boost in performance.

You need more? Here is a list of CPUs compatible with the LGA 1155 socket.

CPU-World