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We present far-ultraviolet spectra of the Seyfert 1 galaxy Mrk 509 obtainedin 1999 November with the Far Ultraviolet Spectroscopic Explorer (FUSE). Ourdata span the observed wavelength range 915-1185 A at a resolution of ~20 km/s.The spectrum shows a blue continuum, broad OVI 1032,1038 emission, and a broadCIII 977 emission line. Superposed on these emission components, we resolveassociated absorption lines of OVI 1032,1038, CIII 977, and Lyman lines throughLzeta. Seven distinct kinematic components are present, spanning a velocityrange of -440 to +170 km/s relative to the systemic velocity. The absorption isclustered in two groups, one centered at -370m km/s and another at the systemicvelocity. The blue-shifted cluster may be associated with the extended lineemission visible in deep images of Mrk 509 obtained by Phillips et al. Althoughseveral components appear to be saturated, they are not black at their centers.Partial covering or scattering permits ~7% of the broad-line or continuum fluxto be unaffected by absorption. Of the multiple components, only one has thesame ionization state and column density as highly ionized gas that producesthe OVII and OVIII ionization edges in X-ray spectra of Mrk 509.  This paper will appear in a special issue of Astrophysical Journal Lettersdevoted to the first scientific results from the FUSE mission.Comment: To appear in the Astrophysical Journal (Letters). 4 pages, 3 color  PostScript figures. Figures are best viewed and printed in color. Added  acknowledgment that this is one of many papers to be published in a special  issue of ApJL devoted to the first scientific results from the FUSE missio

[ITAL]Far Ultraviolet Spectroscopic Explorer[/ITAL] Observations of Intrinsic Absorption in the Seyfert 1 Galaxy Markarian 509