The Tower of the Americas is a 750-foot observation tower/restaurant on the southeastern part of Downtown San Antonio, Texas, USA. The tower was designed by San Antonio architect O'Neil Ford and was built as the theme structure of the 1968 World's Fair, HemisFair '68.

The tower was the tallest observation tower in the United States from 1968 until 1996, when the Las Vegas Stratosphere Tower was completed. It was also the tallest skyscraper in the U.S. State of Texas excluding Dallas and Houston until 2010, when Austin completed The Austonian.

The tower is located in the middle of HemisFair Park and has an observation deck that is accessible by elevator for a fee. In addition, there is also a lounge and revolving restaurant at the top of the tower that provides panoramic views of the city.

The fastest recorded time up the tower's 952 steps is 5 minutes 18 seconds on January 29, 1981.

Construction of the tower began on August 9, 1966 and was completed in approximately 18 months, just in time for the opening ceremonies for the fair held on April 6, 1968. The tophouse of the building was constructed at ground level and hoisted to the top of the poured concrete shaft. As the tophouse was being hoisted into place, on October 30, 1967 some of the cables used to hoist it snapped, leaving it resting on and precariously tilted on the Tower’s shaft. Eventually, oil field pipes were used in lieu of cables to complete the job.

The Americas, or America, are lands in the Western hemisphere, also known as the New World.

In the English language, the Americas refers to the landmasses of North America and South America with their associated islands and regions, whereas America, in current usage, usually refers to the United States of America.

The Americas cover 8.3% of the Earth's total surface area (28.4% of its land area) and contain about 13.5% of the human population (about 900 million people).

The specifics of Paleo-Indian migration to and throughout the Americas, including the exact dates and routes traveled, are subject to ongoing research and discussion. The traditional theory has been that these early migrants moved into the Beringia land bridge between eastern Siberia and present-day Alaska around 40,000–17,000 years ago, when sea levels were significantly lowered due to the Quaternary glaciation. These people are believed to have followed herds of now-extinct pleistocene megafauna along ice-free corridors that stretched between the Laurentide and Cordilleran ice sheets. Another route proposed is that, either on foot or using primitive boats, they migrated down the Pacific Northwest coast to South America. Evidence of the latter would since have been covered by a sea level rise of hundreds of meters following the last ice age.