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Rest-frame far-ultraviolet (FUV) luminosities form the `backbone' of ourunderstanding of star formation at all cosmic epochs. FUV luminosities aretypically corrected for dust by assuming that extinction indicators which havebeen calibrated for local starbursting galaxies apply to all star-forminggalaxies. I present evidence that `normal' star-forming galaxies havesystematically redder UV/optical colors than starbursting galaxies at a givenFUV extinction. This is attributed to differences in star/dust geometry,coupled with a small contribution from older stellar populations. Folding indata for starbursts and ultra-luminous infrared galaxies, I conclude that SFrates from rest-frame UV and optical data alone are subject to large (factorsof at least a few) systematic uncertainties because of dust, which cannot bereliably corrected for using only UV/optical diagnostics.Comment: Conference Proceedings: 4 pages with 3 embedded figures. To appear in  'Galaxy evolution: theory and observations', Eds. V. Avila-Reese, C. Firmani,  C. Frenk, & C. Allen, RevMexAA SC (2002

Dust‐induced Systematic Errors in Ultraviolet‐derived Star Formation Rates