Timothy W. "Tim" Alexander is an American musician best known as the drummer for the rock band Primus.

Alexander played on Primus recordings from Suck on This to Tales from the Punchbowl, before leaving the band in 1996, only to rejoin in 2003 for the EP "Animals Should Not Try to Act Like People".

Tim Alexander is hailed frequently for his "polyrhythmic" playing. Before Primus, Alexander played and recorded with Major Lingo, which at the time was a ska-based rhythm band that featured a lap steel guitar as the lead instrument, played by Tony Bruno.

Alexander got the job with Primus replacing Jay Lane in 1988, and lasted until 1996. Alexander's second stint with Primus was from early 2003 until approximately 2009 when he was replaced by Jay Lane.

Following Alexander's departure from Primus, he went on to form his own group, Laundry, which released on Claypool's label Prawn Song Records. Alexander has also collaborated with experimental bass player Michael Manring and guitarist Alex Skolnick to form the group known as Attention Deficit.

Alexander was the first drummer of A Perfect Circle, performing early live shows with the band, and recording drums for the track "The Hollow" on the band's debut album, Mer de Noms.

Despite being primarily known for his drum work Alexander is also a guitarist and singer. He performed live guitar with the group Born Naked and held the lead vocal duties on Laundry's second album and supporting tour.

Alexander was involved throughout 2008–09 in a project known as into The Presence which features songs by Luis Carlos Maldonado. Their debut album was released on Razor and Tie Records and includes performances from bassist Paz Lenchantin and cellist Ana Lenchantin.

On July 18, 2014, Alexander suffered a heart attack, and underwent open heart surgery. He rejoined Primus for their "Primus and the Chocolate Factory" tour 3 months later on October 22, 2014.