Gregory Paul Walden (born January 10, 1957) is an American politician who served as the U.S. representative for Oregon's 2nd congressional district from 1999 to 2021.

Walden rose to the position of assistant majority leader in the Senate and was considering a bid for Oregon Governor in 1994.

But upon discovering that the son he and his wife were expecting had a heart defect, Walden decided to not run for governor or seek reelection to the state senate.

Walden's candidacy led to fears that the Democrats could take advantage of a split in the Republican vote and take a seat they hadn't held since 1981.

After Senator Gordon Smith's defeat in the 2008 elections, Walden became the only Republican representing Oregon in Congress.

He voted to end the 35-day government shutdown and spoke up about the global warming crisis, but supported Trump in the Ukraine quid pro quo scandal.

In July 2014, he announced he would seek a second term as chair, arguing he would help provide continuity in a changing leadership team after the defeat of House Majority Leader Eric Cantor.

From 2010 to 2011, Walden gave up his seat on the Committee on Energy and Commerce at Republican leadership's request so that Parker Griffith, who had recently switched parties, could take his spot.

"[23] On June 27, 2018, Walden pleaded for a pardon for Dwight and Steven Hammond, who repeatedly committed arson and threatened federal refuge workers over an 18-year period, saying that the original trial's federal judge, Michael Robert Hogan, said that the mandatory sentence would "shock the conscious [sic]".

[28] In 2022, it was reported in The Wall Street Journal that Walden was hired by Mindbloom, a telemedicine-based ketamine-assisted therapy company, for the purpose of lobbying on telehealth policies.