Łukasz Nosek (/ˈnoʊsɪk/;[2] born June 1, 1975) is a Polish-American entrepreneur, notable for being a co-founder of PayPal.

[3] In the summer of 1995, while still in college, he co-founded SponsorNet New Media, Inc., along with fellow Illinois students Max Levchin and Scott Banister.

In 1998, with Max Levchin, Peter Thiel and Ken Howery, Nosek co-founded PayPal, serving as vice president of marketing and strategy, creating the company's "instant transfer" product.

[7] After PayPal went public and was sold to eBay for $1.5 billion in 2002, Nosek left the company to travel and pursue angel investing.

In 2005, with Thiel and Ken Howery, he started Founders Fund, a San Francisco-based venture capital firm with over $1 billion under management.