Weidlinger Associates, Inc., was a U.S.-based structural engineering firm that designs and rehabilitates buildings, bridges, and infrastructure and provides special services in applied science, forensics, and physical security.

The firm is headquartered in New York City, with branch offices in Massachusetts, Connecticut, New Jersey, California, New Mexico, and Washington, DC.

In 2004, Ronald Mayrbaurl and Sante Camo, two Weidlinger principals, published the first-ever guidelines for the inspection and evaluation of suspension bridge cables.

The company's work in applied science research and advanced analysis has resulted in investigative projects concerning the safety of tall buildings,[11] infrastructure, and military installations, as well as mathematical models to explore shielding naval vessels against mine explosions and protecting loading docks against blast.

Weidlinger's software is used by military, public administrative, and corporate clients to simulate structures and devices, enhance design, and assess vulnerability.

[12] Others use imaging techniques to improve the manufacture of integrated circuits, predict the location of underground petroleum reservoirs, and streamline the design of ultrasonic probes for medical use.