(August 7, 2010 - present) (2 children)

Since 2005, Williams has been in a relationship with the Turkish American actress Ayda Field. Despite several break up stories in the press, Williams and Field have been spotted together many times. On 29 January 2008 they were pictured on vacation together at Mammoth Ski Resort in California, accompanied by Max Beesley. She was featured in a UFO documentary that Williams did for BBC Radio 4 in April and took part in a field investigation he did in Trout Lake, Washington in August 2008.

On 8 November 2008, Williams was spotted with Field at football match at the Emirates Stadium home of Arsenal, where he was also seen with Gary Barlow accompanied by his two oldest children, and Williams's longtime friend Jonathan Wilkes. The couple has been living together in a mansion in Wiltshire since the beginning of 2009 according to The Sun. In October 2009, Field appeared in the video of Williams comeback single "Bodies". Williams has been referring to Field as his "wife" in recent interviews.

In November 2009, Williams announced to Jonathan Ross that he was 'in love' with Field. On 26 November 2009, Williams proposed to Ayda Field live on the Australian radio channel 2DayFM in an interview on The Kyle and Jackie O Show. However, it was later revealed by Williams' manager that it was "done as a joke following suggestions it was a stunt which was set up prior to the radio show." His spokesman confirmed: 'He did say it, but he did it in a jocular manner. They are not engaged.' A few days later Williams himself denied the engagement, using his official blog to say "Hey all. We are not engaged. Rob.". On 7 August 2010, Williams and Field married at his home in Los Angeles.

In May 2012, Williams revealed that he and his partner were expecting the birth of a daughter. Theodora Rose was born on 18 September 2012. On April 28, 2014 Robbie announced that he and his wife were expecting baby #2. A boy.On 27 October 2014, his wife gave birth to their son Charlton Valentine.