Altair Engineering is an American product design and development, engineering software and cloud computing software company. Altair was founded by James R Scapa, George Christ, and Mark Kistner in 1985. Over its history, it has had various locations near Detroit, Michigan, USA. It is currently headquartered in Troy, Michigan with regional offices throughout America, Europe and Asia.

Altair Engineering is the creator of the HyperWorks suite of CAE software products.

Altair is divided into three business divisions: Product Design (PD), HyperWorks CAE Software (HW), and PBS Works (PBS)

The principal product offerings from Altair's Commercial Software division is its HyperWorks line of software, including:

The CAE data and process management solutions

The Enterprise Computing division develops and manages:

Subsidiaries of Altair Engineering

Altair Owned Companies

Altair was established in 1985. In 1990, HyperMesh was released. In 1994, Altair receives IndustryWeek's "Technology of the Year" award for OptiStruct.

During the 2008 economy crisis, Altair started a program to offer free training on its product for unemployed persons in Michigan.

In September 2010, Altair purchased a 136,000-square-foot (12,600 m) Annex Facility in Troy, to initially house Altair’s subsidiary ilumisys, Inc.

In September 2011, Altair ProductDesign unveiled BUSolution, a hybrid hydraulic bus.