Williams is married to Michael J. Williams, a federal police officer in Oregon.
The two have been married for more than 20 years, and both flew helicopters in the early days of their careers.
They reside together in suburban Houston, Texas.
She had a pet Jack Russell Terrier named Gorby who was featured with her on the Dog Whisperer television show on the National Geographic Channel on November 12, 2010.
In 2012, Williams expressed a desire to adopt a girl from Ahmedabad.

In September 2007, Williams visited the Sabarmati Ashram and her ancestral village Jhulasan in Gujarat, India.
She was awarded the Sardar Vallabhbhai Patel Vishwa Pratibha Award by the World Gujarati Society, the first person of Indian descent who was not an Indian citizen to be presented the award.
On October 4, 2007, Williams spoke at the American Embassy School, and then met Manmohan Singh, the then Prime Minister of India.

In October 2014, Williams visited Slovenia.
During her stay, amongst other things, she paid a visit to the Astronomical Society Vega in Ljubljana.
She visited Slovenia again in 2016.

On June 7, 2017, the Needham School Committee voted unanimously to name the town's new elementary school the Sunita L. Williams Elementary School.

Williams was a member of the Society of Experimental Test Pilots.

In May 2020, Williams addressed over 500,000 Indian and other international students in the United States in a virtual interview organized by the Student Hub at the Embassy of India, Washington, DC during the COVID-19 Pandemic of 2020.
Williams is married to Michael J. Williams, a federal police officer in Oregon. The two have been married for more than 20 years, and both flew helicopters in the early days of their careers. They reside together in suburban Houston, Texas. She had a pet Jack Russell Terrier named Gorby who was featured with her on the Dog Whisperer television show on the National Geographic Channel on November 12, 2010. In 2012, Williams expressed a desire to adopt a girl from Ahmedabad.
In September 2007, Williams visited the Sabarmati Ashram and her ancestral village Jhulasan in Gujarat, India. She was awarded the Sardar Vallabhbhai Patel Vishwa Pratibha Award by the World Gujarati Society, the first person of Indian descent who was not an Indian citizen to be presented the award. On October 4, 2007, Williams spoke at the American Embassy School, and then met Manmohan Singh, the then Prime Minister of India.
In October 2014, Williams visited Slovenia. During her stay, amongst other things, she paid a visit to the Astronomical Society Vega in Ljubljana. She visited Slovenia again in 2016.
On June 7, 2017, the Needham School Committee voted unanimously to name the town's new elementary school the Sunita L. Williams Elementary School.
Williams was a member of the Society of Experimental Test Pilots.
In May 2020, Williams addressed over 500,000 Indian and other international students in the United States in a virtual interview organized by the Student Hub at the Embassy of India, Washington, DC during the COVID-19 Pandemic of 2020.
Sunita Williams