The LA-2A Leveling Amplifier is an audio compressor produced by Teletronix Engineering Company from 1965 until 1969, and reissued in 2000 by Universal Audio.

The LA-2A was invented by James F. Lawrence II, founder of the Teletronix Engineering Company in Pasadena, California in the early 1960s. The LA-2A had evolved from Lawrence's first leveling amplifier, the LA-1, which was favored by Gene Autry, and its successor, the LA-2, which had been adopted by CBS and RCA. In 1965, Lawrence sold Teletronix to Babcock Electronics of Costa Mesa, California, and in 1967 Bill Putnam's company Studio Electronics (eventually renamed UREI), acquired Babcock's broadcast division, including the Teletronix brand.

Three versions of the LA-2A were made until 1969.

Three decades later, Putnam's sons re-established Universal Audio and the company re-issued an updated version of the popular LA-2A in 1999 with some safety and functional modifications to the original design.

The LA-2A was inducted into the TECnology Hall of Fame in 2004.

The LA-2A is a hand-wired, tube-based compressor. It uses an electroluminescent panel together with a cadmium-sulfide light-dependent resistor (which in the LA-2A's own terminology is called the T4 cell) to provide gain reduction. The properties of the T4 give the LA-2A its unique character by making it an entirely program-dependent design.

The LA-2A has simple controls: a Peak-Reduction knob controls the gain of the side-chain circuit, and therefore, the gain reduction; a Gain Control for make-up gain; and a Limit/Compress switch which alters the compression ratio. The VU meter may also be switched to show the gain reduction or output level.

The average attack time is 10 milliseconds, while the release time is about 60 ms for 50% release and 0.5 to 5 seconds for full release, depending on the previous program material.