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Emerson Lane "Bud" Spencer (October 10, 1906 – May 15, 1985) was an American athlete, winner of gold medal in 4x400 m relay at the 1928 Summer Olympics.

Emerson Spencer won, as a Stanford University student, the NCAA Championships in 440 yd (400 m) in 1928 and set the new 400 m world record of 47.0 in the same year.

At the Amsterdam Olympics, Spencer ran the second leg in the American 4x400 m relay team that won the gold medal with a new world record of 3.14.2. A week later in London, Spencer bettered his own 4x400 m relay world record to 3.13.4.

He was married to Laura 'Henrietta' Halliday (d. of Dr. John LeRoy & Tacy Marie Halliday) in Memorial Church, Stanford University, Tuesday, September 1, 1931. She was from Wellington, KS- HS class of 1924.

Emerson Spencer died in Palo Alto, California, aged 78.