Who are the two Beatles that are left handed?

Paul McCartney and Ringo Starr are left handed.

Starr is left-handed yet plays a right-handed kit; his tendency to lead with his left hand contributes to his distinctive drumming style.

Starr commented: "I'm no good on the technical things ... I'm your basic offbeat drummer with funny fills ... because I'm really left-handed playing a right-handed kit. I can't roll around the drums because of that.

https://en.wikipedia.org/wiki/Ringo_Starr

The Beatles featured two left handed members, Paul, whom everyone saw holding his Hoffner bass left handed, and Ringo, whose left handedness is at least partially to blame for his 'original' drumming style.
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Will the real Paul McCartney raise your hand? - Is Paul McCartney right-handed or left-handed? A long-standing confusion among Beatles fans is cleared up by this article.
http://www.beatlesagain.com/breflib.html