富豪B9TL（Volvo B9TL），是富豪車廠（Volvo）2002年投產的一款超低地台雙層巴士底盤。
富豪車廠開發這款巴士，目的是要取代富豪超級奧林比安雙層巴士底盤（Super Olympian，又稱B10TL）。
底盤設計沿於英國本土的B7TL，配以雷諾設計的新款9.3公升引擎，引擎輸出得以提升，爬坡能力較前代稍有改善。同時底盤本來是為備有旋轉樓梯的車身而設，因為載通國際當時以引入直梯巴士為主，廠方被逼修改底盤設計。
外觀上，配置Wright Eclipse Gemini車身的B9TL與Wright Explorer車身的B10TL的最大分別在於B9TL的散熱水箱置於車尾，而B10TL的則置於右側前軸之後。Wright車身B9TL的車尾牌照位置亦有置於上方車窗右下側及下方保險槓兩種款式。九巴及愉景灣交通服務的Wright車身B9TL尾部車牌全部位於上方，而新創建交通服務的Wright車身B9TL的尾部車牌除城巴10.6米樣辦車（7500／PN8018）置於上方外均置於下方，港鐵巴士的Wright車身B9TL尾車牌全部置於下方。
自2012年起，全新方梯設計的富豪B9TL三軸版底盤可以搭配Enviro500 MMC車身，惟有關配搭從未在香港出現。
The Volvo B9TL is a low-floor double-decker bus chassis built by Volvo Buses Ltd from 2002.
The B9TL chassis shared the same design of the B7TL. The key difference from both its predecessor, the B10TL Super Olympian and B7TL, is the new 9.3-litre engine originally designed by Renault Trucks. The radiator is located at the rear offside, similar the smaller B7TL. The front module design is shared with other low-floor bus chassis built by Volvo, and independent suspension is fitted at the front axle (replaced by conventional front suspension after some years of production).
The B9TL was initially offered in 3-axle format, and the 2-axle variant was added in 2006 to replace the B7TL. The driveline comprises a Volvo D9A Euro III engine (rated at 300bhp or 340bhp), which was later replaced by the Volvo D9B Euro IV engine (uses selective catalytic reduction technology; two versions were offered - the D9B260 rated at 260bhp for 2-axle version, and a higher powered D9B310, rated at 310bhp, for 3-axle version), and coupled to a ZF 5/6-speed gearbox. Volvo also offer the Voith 4-speed gearbox as an option.
The front wheels of 3-axle B9TL are usually supplied by ALCOA of the USA, but some buses (including the 3 prototypes) have all their wheels supplied by ALCOA.
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