The Wright Eclipse Gemini is a low-floor double-decker bus body that was built by Wrightbus since 2001, based on the single-decker Wright Eclipse design. The second-generation Eclipse Gemini 2 was launched in 2009, followed by the third-generation Gemini 3 in 2013. Additionally, the body was available on Volvo Super Olympian chassis in Hong Kong between 2003 and 2005, marketed as the Wright Explorer.

The original Eclipse Gemini was launched in 2001 on Volvo B7TL chassis; from 2006, the body was also built on the replacement Volvo B9TL chassis and, from 2013, on the B9TL's replacement, the Volvo B5TL. From 2008, the body was also available on Volvo B5LH hybrid chassis. Eclipse Gemini's exported to the Asian market have been offered a choice of the tri-axle Volvo B8L and the Scania K410EB.

Wright Eclipse Gemini bodied buses were mass-introduced on London Buses services from 2001. It has also been popular with FirstGroup, who from 2003 onwards have purchased over 1,200 into service. Dublin Bus and Bus Éireann have also acquired many Volvo B9TLs with Wright Eclipse Gemini bodywork.

The Wright Eclipse Gemini was launched in 2001, initially on the Volvo B7TL chassis, as a double decker version of the existing Wright Eclipse body. The original Eclipse Gemini, and all versions up until the facelifted Gemini 3, have both the upper and lower deck front windscreens forming part of a single oval shape, with the destination blind in between. The interior of the Eclipse Gemini features curves similar to its exterior, and continues the modern feel.

In 2006, the Volvo B7TL chassis, which had been the subject of noise complaints, was superseded by the Volvo B9TL, with Wrightbus launching a facelifted version of the Wright Eclipse Gemini to fit the new chassis. The updated styling was largely confined to the rear of the body, where it has a more rounded appearance compared to the original and a central LED route number panel, housed within a smoked glass effect panel underneath the upper rear window. Other external modifications included the relocation of the rear number plate from its integrated position with the upper rear window to a more conventional siting at the bottom of the bus.

The first-generation Wright Eclipse Gemini was highly popular with the FirstGroup, with the group ordering examples from 2004 onwards. Wright Eclipse Geminis on the Volvo B7TL chassis entered service with First Glasgow, First West and South Yorkshire, and First Leicester, among others, between 2004 and the B7TL's discontinuation in 2007. The first examples on the following Volvo B9TL chassis entered service with First South Yorkshire and First Glasgow in 2007, subsequently followed by a large order from First Greater Manchester, who ordered over 200 of the type from 2007 to 2010.

In London, the Wright Eclipse Gemini on the Volvo B7TL chassis was also highly popular with Transport for London operators, although these buses were the subject of criticism for noise from their cooling fans. Arriva London were the launch customer for the Wright Eclipse Gemini, taking on its first two of the type in July 2001, one of which was displayed at the 2001 International Association of Public Transport conference at the Earls Court Exhibition Centre. Arriva London would go on to operate a total 179 Wright Eclipse Geminis on the Volvo B7TL chassis, while 273 B7TL Geminis were delivered to Go-Ahead London Central and London General, 209 to First Capital, 73 to Travel London, 44 to East Thames Buses and three delivered to London United. A single Euro IV Volvo B9TL demonstrator with Wright Eclipse Gemini bodywork was delivered to London Central in July 2006, however orders did not materialise.

Lothian Buses were another popular customer of the Wright Eclipse Gemini, initially ordering 125 on the Volvo B7TL chassis between 2005 and 2006, having previously standardised with the Plaxton President on the Dennis Trident chassis. The company moved onto the Volvo B9TL chassis in 2007, taking on a first batch of 50 that year. The Wright Eclipse Gemini on the Volvo B7TL chassis was similarly popular with Travel West Midlands, taking delivery of 150 of the type between 2004 and 2006, as well as Translink of Northern Ireland, who took delivery of 125 Geminis on Volvo B9TL chassis during 2007 for use by both its Metro and Ulsterbus companies.